1529 lines
139 KiB
HTML
1529 lines
139 KiB
HTML
<!DOCTYPE html>
|
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<html lang="en">
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<head>
|
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<link rel="profile" href="http://gmpg.org/xfn/11">
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<link rel="pingback" href="https://sdarchitect.blog/xmlrpc.php">
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<title>Understanding Observability – Home: sdarchitect.blog</title>
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<script type="text/javascript">
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WebFontConfig = {"google":{"families":["Ubuntu:r:latin,latin-ext","Ubuntu:r,i,b,bi:latin,latin-ext"]},"api_url":"https:\/\/fonts-api.wp.com\/css"};
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(function() {
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var wf = document.createElement('script');
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wf.src = '/wp-content/plugins/custom-fonts/js/webfont.js';
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wf.type = 'text/javascript';
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wf.async = 'true';
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var s = document.getElementsByTagName('script')[0];
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s.parentNode.insertBefore(wf, s);
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})();
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</script><style id="jetpack-custom-fonts-css">.wf-active body{font-family:"Ubuntu",sans-serif}.wf-active blockquote{font-family:"Ubuntu",sans-serif}.wf-active blockquote cite{font-family:"Ubuntu",sans-serif}.wf-active code, .wf-active kbd, .wf-active pre, .wf-active tt, .wf-active var{font-family:"Ubuntu",sans-serif}.wf-active pre{font-family:"Ubuntu",sans-serif}.wf-active .menu-toggle{font-family:"Ubuntu",sans-serif}.wf-active .is-singular .post-navigation .nav-links span.nav-subtitle{font-family:"Ubuntu",sans-serif}.wf-active .comments-title .add-comment-link{font-family:"Ubuntu",sans-serif}.wf-active .comment-navigation a{font-family:"Ubuntu",sans-serif}.wf-active .widget-title{font-family:"Ubuntu",sans-serif}.wf-active h1, .wf-active h2, .wf-active h3, .wf-active h4, .wf-active h5, .wf-active h6{font-family:"Ubuntu",sans-serif;font-weight:400;font-style:normal}.wf-active h1{font-weight:400;font-style:normal}.wf-active h2{font-style:normal;font-weight:400}.wf-active h3{font-style:normal;font-weight:400}.wf-active h4{font-style:normal;font-weight:400}.wf-active h5{font-family:"Ubuntu",sans-serif;font-style:normal;font-weight:400}.wf-active h6{font-family:"Ubuntu",sans-serif;font-style:normal;font-weight:400}.wf-active .site-title{font-style:normal;font-weight:400}.wf-active .site-banner h1{font-style:normal;font-weight:400}.wf-active .comment-body h1, .wf-active .entry-content h1{font-style:normal;font-weight:400}.wf-active .page-title h1{font-style:normal;font-weight:400}.wf-active .posts .entry-title{font-weight:400;font-style:normal}.wf-active .author-link, .wf-active .is-singular .post-navigation .nav-links span.nav-title{font-family:"Ubuntu",sans-serif;font-style:normal;font-weight:400}.wf-active .comments-title{font-style:normal;font-weight:400}.wf-active .widget h1, .wf-active .widget h2, .wf-active .widget h3, .wf-active .widget h4, .wf-active .widget h5, .wf-active .widget h6{font-family:"Ubuntu",sans-serif;font-style:normal;font-weight:400}.wf-active .is-singular.archive-eventbrite .entry-header h1{font-style:normal;font-weight:400}@media screen and (min-width: 1601px){.wf-active .site-banner h1{font-style:normal;font-weight:400}}@media screen and (max-width: 1400px){.wf-active .site-banner h1{font-style:normal;font-weight:400}}@media screen and (max-width: 1200px){.wf-active .site-banner h1{font-style:normal;font-weight:400}}@media screen and (max-width: 680px){.wf-active .site-banner h1{font-style:normal;font-weight:400}}@media screen and (max-width: 1200px){.wf-active .is-singular .entry-header h1, .wf-active .error404 .entry-header h1, .wf-active .page-header h1, .wf-active .page-template-eventbrite-index .page-header h1, .wf-active .single-event .entry-header h1{font-style:normal;font-weight:400}}@media screen and (max-width: 1200px){.wf-active .is-singular.archive-eventbrite .entry-header h1{font-style:normal;font-weight:400}}@media screen and (max-width: 960px){.wf-active .is-singular:not(.eventbrite-archive) .entry-header h1, .wf-active .error404 .entry-header h1, .wf-active .page-header h1{font-style:normal;font-weight:400}}@media screen and (max-width: 680px){.wf-active .is-singular:not(.eventbrite-archive) .entry-header h1, .wf-active .error404 .entry-header h1, .wf-active .page-header h1, .wf-active .page-template-eventbrite-index .page-header h1, .wf-active .single-event .entry-header h1{font-style:normal;font-weight:400}}@media screen and (max-width: 680px){.wf-active .is-singular.archive-eventbrite .entry-header h1{font-style:normal;font-weight:400}}</style>
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<meta name='robots' content='max-image-preview:large' />
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<meta name="google-site-verification" content="zPSexgUex_Uv56IWUC0eY70dmOymmZusjigBK4K3twM" />
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<meta name="msvalidate.01" content="04EE296B3435D0E50BCC2E7554E4D49D" />
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<!-- Async WordPress.com Remote Login -->
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<script id="wpcom_remote_login_js">
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var wpcom_remote_login_extra_auth = '';
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function wpcom_remote_login_remove_dom_node_id( element_id ) {
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var dom_node = document.getElementById( element_id );
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if ( dom_node ) { dom_node.parentNode.removeChild( dom_node ); }
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}
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function wpcom_remote_login_remove_dom_node_classes( class_name ) {
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var dom_nodes = document.querySelectorAll( '.' + class_name );
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for ( var i = 0; i < dom_nodes.length; i++ ) {
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dom_nodes[ i ].parentNode.removeChild( dom_nodes[ i ] );
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}
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}
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function wpcom_remote_login_final_cleanup() {
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wpcom_remote_login_remove_dom_node_classes( "wpcom_remote_login_msg" );
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wpcom_remote_login_remove_dom_node_id( "wpcom_remote_login_key" );
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wpcom_remote_login_remove_dom_node_id( "wpcom_remote_login_validate" );
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wpcom_remote_login_remove_dom_node_id( "wpcom_remote_login_js" );
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wpcom_remote_login_remove_dom_node_id( "wpcom_request_access_iframe" );
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wpcom_remote_login_remove_dom_node_id( "wpcom_request_access_styles" );
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}
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// Watch for messages back from the remote login
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window.addEventListener( "message", function( e ) {
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if ( e.origin === "https://r-login.wordpress.com" ) {
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var data = {};
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try {
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data = JSON.parse( e.data );
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} catch( e ) {
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wpcom_remote_login_final_cleanup();
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return;
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}
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if ( data.msg === 'LOGIN' ) {
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// Clean up the login check iframe
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wpcom_remote_login_remove_dom_node_id( "wpcom_remote_login_key" );
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|
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var id_regex = new RegExp( /^[0-9]+$/ );
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var token_regex = new RegExp( /^.*|.*|.*$/ );
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if (
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token_regex.test( data.token )
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&& id_regex.test( data.wpcomid )
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) {
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// We have everything we need to ask for a login
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var script = document.createElement( "script" );
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script.setAttribute( "id", "wpcom_remote_login_validate" );
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script.src = '/remote-login.php?wpcom_remote_login=validate'
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+ '&wpcomid=' + data.wpcomid
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+ '&token=' + encodeURIComponent( data.token )
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+ '&host=' + window.location.protocol
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+ '//' + window.location.hostname
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+ '&postid=1112'
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+ '&is_singular=1';
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document.body.appendChild( script );
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}
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return;
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}
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// Safari ITP, not logged in, so redirect
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if ( data.msg === 'LOGIN-REDIRECT' ) {
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window.location = 'https://wordpress.com/log-in?redirect_to=' + window.location.href;
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return;
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}
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// Safari ITP, storage access failed, remove the request
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if ( data.msg === 'LOGIN-REMOVE' ) {
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var css_zap = 'html { -webkit-transition: margin-top 1s; transition: margin-top 1s; } /* 9001 */ html { margin-top: 0 !important; } * html body { margin-top: 0 !important; } @media screen and ( max-width: 782px ) { html { margin-top: 0 !important; } * html body { margin-top: 0 !important; } }';
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var style_zap = document.createElement( 'style' );
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style_zap.type = 'text/css';
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style_zap.appendChild( document.createTextNode( css_zap ) );
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document.body.appendChild( style_zap );
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var e = document.getElementById( 'wpcom_request_access_iframe' );
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e.parentNode.removeChild( e );
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document.cookie = 'wordpress_com_login_access=denied; path=/; max-age=31536000';
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return;
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}
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|
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// Safari ITP
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if ( data.msg === 'REQUEST_ACCESS' ) {
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console.log( 'request access: safari' );
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// Check ITP iframe enable/disable knob
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if ( wpcom_remote_login_extra_auth !== 'safari_itp_iframe' ) {
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return;
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||
}
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||
|
||
// If we are in a "private window" there is no ITP.
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var private_window = false;
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try {
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var opendb = window.openDatabase( null, null, null, null );
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} catch( e ) {
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private_window = true;
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}
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if ( private_window ) {
|
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console.log( 'private window' );
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return;
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}
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|
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var iframe = document.createElement( 'iframe' );
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iframe.id = 'wpcom_request_access_iframe';
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iframe.setAttribute( 'scrolling', 'no' );
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iframe.setAttribute( 'sandbox', 'allow-storage-access-by-user-activation allow-scripts allow-same-origin allow-top-navigation-by-user-activation' );
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iframe.src = 'https://r-login.wordpress.com/remote-login.php?wpcom_remote_login=request_access&origin=' + encodeURIComponent( data.origin ) + '&wpcomid=' + encodeURIComponent( data.wpcomid );
|
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|
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var css = 'html { -webkit-transition: margin-top 1s; transition: margin-top 1s; } /* 9001 */ html { margin-top: 46px !important; } * html body { margin-top: 46px !important; } @media screen and ( max-width: 660px ) { html { margin-top: 71px !important; } * html body { margin-top: 71px !important; } #wpcom_request_access_iframe { display: block; height: 71px !important; } } #wpcom_request_access_iframe { border: 0px; height: 46px; position: fixed; top: 0; left: 0; width: 100%; min-width: 100%; z-index: 99999; background: #23282d; } ';
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|
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var style = document.createElement( 'style' );
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style.type = 'text/css';
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style.id = 'wpcom_request_access_styles';
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style.appendChild( document.createTextNode( css ) );
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||
document.body.appendChild( style );
|
||
|
||
document.body.appendChild( iframe );
|
||
}
|
||
|
||
if ( data.msg === 'DONE' ) {
|
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wpcom_remote_login_final_cleanup();
|
||
}
|
||
}
|
||
}, false );
|
||
|
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// Inject the remote login iframe after the page has had a chance to load
|
||
// more critical resources
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window.addEventListener( "DOMContentLoaded", function( e ) {
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var iframe = document.createElement( "iframe" );
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iframe.style.display = "none";
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iframe.setAttribute( "scrolling", "no" );
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iframe.setAttribute( "id", "wpcom_remote_login_key" );
|
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iframe.src = "https://r-login.wordpress.com/remote-login.php"
|
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+ "?wpcom_remote_login=key"
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+ "&origin=aHR0cHM6Ly9zZGFyY2hpdGVjdC5ibG9n"
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+ "&wpcomid=35079635"
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+ "&time=" + Math.floor( Date.now() / 1000 );
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document.body.appendChild( iframe );
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}, false );
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</script>
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<link rel='dns-prefetch' href='//s1.wp.com' />
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<link rel='dns-prefetch' href='//s2.wp.com' />
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<link rel='dns-prefetch' href='//widgets.wp.com' />
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<link rel='dns-prefetch' href='//fonts-api.wp.com' />
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<link rel='dns-prefetch' href='//s0.wp.com' />
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<link rel='dns-prefetch' href='//af.pubmine.com' />
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<link rel="alternate" type="application/rss+xml" title="Home: sdarchitect.blog » Feed" href="https://sdarchitect.blog/feed/" />
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||
<link rel="alternate" type="application/rss+xml" title="Home: sdarchitect.blog » Comments Feed" href="https://sdarchitect.blog/comments/feed/" />
|
||
<link rel="alternate" type="application/rss+xml" title="Home: sdarchitect.blog » Understanding Observability Comments Feed" href="https://sdarchitect.blog/2020/01/08/understanding-observability/feed/" />
|
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<script type="text/javascript">
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/* <![CDATA[ */
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function addLoadEvent(func) {
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var oldonload = window.onload;
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if (typeof window.onload != 'function') {
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window.onload = func;
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} else {
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window.onload = function () {
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oldonload();
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func();
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}
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}
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}
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/* ]]> */
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</script>
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<style id="wp-img-auto-sizes-contain-inline-css">
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img:is([sizes=auto i],[sizes^="auto," i]){contain-intrinsic-size:3000px 1500px}
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/*# sourceURL=wp-img-auto-sizes-contain-inline-css */
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</style>
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<link crossorigin='anonymous' rel='stylesheet' id='all-css-2-1' href='/_static/??-eJx9jFEKAjEMRC9kjfrh4od4ltKGpdu0CSaleHtbEQQRCQw8ZvKgiwtcDatBaU6orakq9BRXNAVso+Wc0JHvYFiEvKGC2oNwH1R38FuwoYkP+c1QmGfERuP5jlMSnbDaF/1TUsr4Eb9ozm/lelyWw2Xc6bw9AWlRTZ8=&cssminify=yes' type='text/css' media='all' />
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<style id="wp-emoji-styles-inline-css">
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||
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img.wp-smiley, img.emoji {
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display: inline !important;
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border: none !important;
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box-shadow: none !important;
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height: 1em !important;
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width: 1em !important;
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margin: 0 0.07em !important;
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vertical-align: -0.1em !important;
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background: none !important;
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padding: 0 !important;
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}
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/*# sourceURL=wp-emoji-styles-inline-css */
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</style>
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<style id="wp-block-library-inline-css">
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:root{--wp-block-synced-color:#7a00df;--wp-block-synced-color--rgb:122,0,223;--wp-bound-block-color:var(--wp-block-synced-color);--wp-editor-canvas-background:#ddd;--wp-admin-theme-color:#007cba;--wp-admin-theme-color--rgb:0,124,186;--wp-admin-theme-color-darker-10:#006ba1;--wp-admin-theme-color-darker-10--rgb:0,107,160.5;--wp-admin-theme-color-darker-20:#005a87;--wp-admin-theme-color-darker-20--rgb:0,90,135;--wp-admin-border-width-focus:2px}@media (min-resolution:192dpi){:root{--wp-admin-border-width-focus:1.5px}}.wp-element-button{cursor:pointer}:root .has-very-light-gray-background-color{background-color:#eee}:root .has-very-dark-gray-background-color{background-color:#313131}:root .has-very-light-gray-color{color:#eee}:root .has-very-dark-gray-color{color:#313131}:root .has-vivid-green-cyan-to-vivid-cyan-blue-gradient-background{background:linear-gradient(135deg,#00d084,#0693e3)}:root .has-purple-crush-gradient-background{background:linear-gradient(135deg,#34e2e4,#4721fb 50%,#ab1dfe)}:root .has-hazy-dawn-gradient-background{background:linear-gradient(135deg,#faaca8,#dad0ec)}:root .has-subdued-olive-gradient-background{background:linear-gradient(135deg,#fafae1,#67a671)}:root .has-atomic-cream-gradient-background{background:linear-gradient(135deg,#fdd79a,#004a59)}:root .has-nightshade-gradient-background{background:linear-gradient(135deg,#330968,#31cdcf)}:root .has-midnight-gradient-background{background:linear-gradient(135deg,#020381,#2874fc)}:root{--wp--preset--font-size--normal:16px;--wp--preset--font-size--huge:42px}.has-regular-font-size{font-size:1em}.has-larger-font-size{font-size:2.625em}.has-normal-font-size{font-size:var(--wp--preset--font-size--normal)}.has-huge-font-size{font-size:var(--wp--preset--font-size--huge)}:root .has-text-align-center{text-align:center}:root .has-text-align-left{text-align:left}:root .has-text-align-right{text-align:right}.has-fit-text{white-space:nowrap!important}#end-resizable-editor-section{display:none}.aligncenter{clear:both}.items-justified-left{justify-content:flex-start}.items-justified-center{justify-content:center}.items-justified-right{justify-content:flex-end}.items-justified-space-between{justify-content:space-between}.screen-reader-text{word-wrap:normal!important;border:0;clip-path:inset(50%);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px;word-break:normal!important}.screen-reader-text:focus{background-color:#ddd;clip-path:none;color:#444;display:block;font-size:1em;height:auto;left:5px;line-height:normal;padding:15px 23px 14px;text-decoration:none;top:5px;width:auto;z-index:100000}html :where(.has-border-color){border-style:solid}html :where([style^=border-color],[style*=";border-color"],[style*="; border-color"]){border-style:solid}html :where([style^=border-top-color],[style*=";border-top-color"],[style*="; border-top-color"]){border-top-style:solid}html :where([style^=border-right-color],[style*=";border-right-color"],[style*="; border-right-color"]){border-right-style:solid}html :where([style^=border-bottom-color],[style*=";border-bottom-color"],[style*="; border-bottom-color"]){border-bottom-style:solid}html :where([style^=border-left-color],[style*=";border-left-color"],[style*="; border-left-color"]){border-left-style:solid}html :where([style^=border-width],[style*=";border-width"],[style*="; border-width"]){border-style:solid}html :where([style^=border-top-width],[style*=";border-top-width"],[style*="; border-top-width"]){border-top-style:solid}html :where([style^=border-right-width],[style*=";border-right-width"],[style*="; border-right-width"]){border-right-style:solid}html :where([style^=border-bottom-width],[style*=";border-bottom-width"],[style*="; border-bottom-width"]){border-bottom-style:solid}html :where([style^=border-left-width],[style*=";border-left-width"],[style*="; border-left-width"]){border-left-style:solid}html :where(img[class*=wp-image-]){height:auto;max-width:100%}:where(figure){margin:0 0 1em}html :where(.is-position-sticky){--wp-admin--admin-bar--position-offset:var(--wp-admin--admin-bar--height,0px)}@media screen and (max-width:600px){html :where(.is-position-sticky){--wp-admin--admin-bar--position-offset:0px}}
|
||
|
||
/*# sourceURL=/wp-content/plugins/gutenberg-core/v23.9.1/build/styles/block-library/common.min.css */
|
||
</style>
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<style id="wp-block-group-inline-css">
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||
.wp-block-group{box-sizing:border-box}:where(.wp-block-group.wp-block-group-is-layout-constrained){position:relative}
|
||
/*# sourceURL=/wp-content/plugins/gutenberg-core/v23.9.1/build/styles/block-library/group/style.min.css */
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||
</style>
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||
<style id="wp-block-group-theme-inline-css">
|
||
:where(.wp-block-group.has-background){padding:1.25em 2.375em}
|
||
/*# sourceURL=/wp-content/plugins/gutenberg-core/v23.9.1/build/styles/block-library/group/theme.min.css */
|
||
</style>
|
||
<style id="wp-block-quote-inline-css">
|
||
.wp-block-quote{box-sizing:border-box;overflow-wrap:break-word}.wp-block-quote.is-large:where(:not(.is-style-plain)),.wp-block-quote.is-style-large:where(:not(.is-style-plain)){margin-bottom:1em;padding:0 1em}.wp-block-quote.is-large:where(:not(.is-style-plain)) p,.wp-block-quote.is-style-large:where(:not(.is-style-plain)) p{font-size:1.5em;font-style:italic;line-height:1.6}.wp-block-quote.is-large:where(:not(.is-style-plain)) cite,.wp-block-quote.is-large:where(:not(.is-style-plain)) footer,.wp-block-quote.is-style-large:where(:not(.is-style-plain)) cite,.wp-block-quote.is-style-large:where(:not(.is-style-plain)) footer{font-size:1.125em;text-align:right}.wp-block-quote>cite{display:block}
|
||
/*# sourceURL=/wp-content/plugins/gutenberg-core/v23.9.1/build/styles/block-library/quote/style.min.css */
|
||
</style>
|
||
<style id="wp-block-quote-theme-inline-css">
|
||
.wp-block-quote{border-left:.25em solid;margin:0 0 1.75em;padding-left:1em}.wp-block-quote cite,.wp-block-quote footer{color:currentColor;font-size:.8125em;font-style:normal;position:relative}.wp-block-quote:where(.has-text-align-right){border-left:none;border-right:.25em solid;padding-left:0;padding-right:1em}.wp-block-quote:where(.has-text-align-center){border:none;padding-left:0}.wp-block-quote.is-large,.wp-block-quote.is-style-large,.wp-block-quote:where(.is-style-plain){border:none}
|
||
/*# sourceURL=/wp-content/plugins/gutenberg-core/v23.9.1/build/styles/block-library/quote/theme.min.css */
|
||
</style>
|
||
<style id="wp-block-image-inline-css">
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<style id="wp-block-image-theme-inline-css">
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:root :where(.wp-block-image figcaption){color:#555;font-size:13px;text-align:center}.is-dark-theme :root :where(.wp-block-image figcaption){color:hsla(0,0%,100%,.65)}.wp-block-image{margin:0 0 1em}
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/*# sourceURL=/wp-content/plugins/gutenberg-core/v23.9.1/build/styles/block-library/image/theme.min.css */
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<style id="wp-block-list-inline-css">
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ol,ul{box-sizing:border-box}:root :where(.wp-block-list.has-background){padding:1.25em 2.375em}
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<style id="wp-block-paragraph-inline-css">
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.is-small-text{font-size:.875em}.is-regular-text{font-size:1em}.is-large-text{font-size:2.25em}.is-larger-text{font-size:3em}.has-drop-cap:not(:focus):first-letter{float:left;font-size:8.4em;font-style:normal;font-weight:100;line-height:.68;margin:.05em .1em 0 0;text-transform:uppercase}body.rtl .has-drop-cap:not(:focus):first-letter{float:none;margin-left:.1em}p.has-drop-cap.has-background{overflow:hidden}:root :where(p.has-background){padding:1.25em 2.375em}:where(p.has-text-color:not(.has-link-color)) a{color:inherit}p.has-text-align-left[style*="writing-mode:vertical-lr"],p.has-text-align-right[style*="writing-mode:vertical-rl"]{rotate:180deg}
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/*# sourceURL=/wp-content/plugins/gutenberg-core/v23.9.1/build/styles/block-library/paragraph/style.min.css */
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</style>
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<style id="wp-block-library-inline-css-extra">
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.has-text-align-justify {
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text-align:justify;
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}
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.has-text-align-justify{text-align:justify;}
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/*# sourceURL=wp-block-library-inline-css */
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</style>
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<style id="classic-theme-styles-inline-css">
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.wp-block-button__link{background-color:#32373c;border-radius:9999px;box-shadow:none;color:#fff;font-size:1.125em;padding:calc(.667em + 2px) calc(1.333em + 2px);text-decoration:none}.wp-block-file__button{background:#32373c;color:#fff}.wp-block-accordion-heading{margin:0}.wp-block-accordion-heading__toggle{background-color:inherit!important;color:inherit!important}.wp-block-accordion-heading__toggle:not(:focus-visible){outline:none}.wp-block-accordion-heading__toggle:focus,.wp-block-accordion-heading__toggle:hover{background-color:inherit!important;border:none;box-shadow:none;color:inherit;padding:var(--wp--preset--spacing--20,1em) 0;text-decoration:none}.wp-block-accordion-heading__toggle:focus-visible{outline:auto;outline-offset:0}.wp-block-tab:not(.has-text-color){color:inherit!important}.wp-block-tab:not(.has-background){background-color:inherit!important}.wp-block-tab:focus,.wp-block-tab:hover{text-decoration:none}.wp-block-tab:focus-visible{outline:auto;outline-offset:0}
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/*# sourceURL=/wp-content/plugins/gutenberg-core/v23.9.1/build/styles/block-library/classic.min.css */
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</style>
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<style id="coblocks-inline-format-inline-css">
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.uppercase{text-transform:uppercase}
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/*# sourceURL=coblocks-inline-format-inline-css */
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</style>
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<article id="post-1112" class="post-1112 post type-post status-publish format-standard hentry category-cloud category-sre tag-cloud-native tag-monitoring tag-observability tag-sre">
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<h1 class="entry-title">Understanding Observability</h1>
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<div class="posted-info"><span class="byline">Posted by <span class="author vcard"><a class="url fn n" href="https://sdarchitect.blog/author/sdarchitect/">Sanjeev Sharma</a></span></span><span class="posted-on"> <span class="date-published-word">on</span> <a href="https://sdarchitect.blog/2020/01/08/understanding-observability/" rel="bookmark"><time class="entry-date published" datetime="2020-01-08T17:14:09-05:00">January 8, 2020</time><time class="updated" datetime="2020-01-25T17:31:43-05:00">January 25, 2020</time></a></span></div> </div><!-- .entry-posted -->
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<div class="entry-content">
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<p class="p1 wp-block-paragraph">Last week my understanding of <i>Observability </i>went up astronomically. In fact, it was taken to an all new dimension, all by one tweet by <a href="https://www.linkedin.com/in/charity-majors/" target="_blank" rel="noopener">Charity Majors</a> (@<a href="https://twitter.com/mipsytipsy" target="_blank" rel="noopener">mipsytipsy</a>):</p>
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<blockquote class="wp-block-quote twitter-tweet is-layout-flow wp-block-quote-is-layout-flow"><p dir="ltr" lang="en">Observability, short and sweet:</p><p>– can you understand whatever internal state the system has gotten itself into?</p><p>…just by inspecting and interrogating its output?</p><p>…even if (especially if) you have never seen it happen before? <a href="https://t.co/0HslcUKoOQ">https://t.co/0HslcUKoOQ</a></p><p>— Charity Majors (@mipsytipsy) <a href="https://twitter.com/mipsytipsy/status/1199447610160902144?ref_src=twsrc%5Etfw">November 26, 2019</a></p></blockquote>
|
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<p class="wp-block-paragraph">Let me begin by taking you back to a consulting engagement I worked on recently. I was working with a client helping them determine how to improve the maturity of their <a href="https://sdarchitect.blog/2017/06/26/cloud-service-reliability-part-i-apollo-13-to-google-sre/">SRE</a> team. (Spoiler alert – they sucked. Renaming the team of DevOps engineers as ‘SREs’ does not make them SREs). Getting back to my story, they had built what they called their ’Observability’ platform. It was pretty impressive (their concepts of SRE were however a gross misunderstanding of what it means to adopt SRE in an enterprise that does not truly have resilient, atomic services like Google, but more on that in a later post). Back again to my story – their ‘Observability’ platform allowed them to monitor their services at the infrastructure, system and service levels. They continuously ran a slate of synthetic transactions at a fixed cadence from a server outside the firewall and measured key SLI’s. The automation of their alerts was on steroids. Anytime any threshold of any SLI was breached, alerts were sent out and tickets were opened and assigned. The monitoring across the Infrastructure, system and service level allowed them to pinpoint the potential areas of the stack impacted, allowing the ‘SRE’ team to respond appropriately. I walked away from the engagement delivering them a set of recommendations to improve their processes to better their SRE maturity, and with their monitoring and alerting setup becoming my understanding of <i>Observability.</i></p>
|
||
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||
<p class="wp-block-paragraph">But I was just scratching the surface here. After dissecting Charity’s said tweet, and others on her Twitter thread, I understood that what my client had was good <i>Telemetry</i>, not <i>Observability</i>. Let me explain by parsing Charity’s tweet for you and providing my thesis of the same.</p>
|
||
|
||
|
||
|
||
<p class="wp-block-paragraph"><b>Statement 1:</b></p>
|
||
|
||
|
||
|
||
<p class="wp-block-paragraph"><i>– can you understand whatever internal state the system has gotten itself into?</i></p>
|
||
|
||
|
||
|
||
<p class="wp-block-paragraph">Oh sure, if I have good telemetry at both the system level and individual service level of my system, sure I can understand what state my system is at.</p>
|
||
|
||
|
||
|
||
<p class="wp-block-paragraph"><b>Statement 2:</b></p>
|
||
|
||
|
||
|
||
<p class="wp-block-paragraph"><i>…just by inspecting and interrogating its output?</i></p>
|
||
|
||
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||
<p class="wp-block-paragraph">Now that’s interesting. Just by inspecting logs (yes, logs are output too) and interrogating the regular output data coming from the system. Maybe…</p>
|
||
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||
|
||
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||
<p class="wp-block-paragraph"><b>Statement 3:</b></p>
|
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<p class="wp-block-paragraph"><i>…even if (especially if) you have never seen it happen before? </i></p>
|
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|
||
<p class="wp-block-paragraph">Houston, we are stumped. ‘If we have never seen it before’ is a problem. All monitoring is based on a prior determination of what needs to be monitored. What SLIs are important to us and hence need to be measured? What thresholds or SLOs, when breached, merit an alert or a ticket being opened? What will be needed to be known about the systems state at such a time? These are all assumptions that need to be made before we set up our monitoring regime. This does not necessarily make the monitoring capable of being used to determine the internal<i> </i>state of the system from ‘any’ perspective. To look at the statement in the original Tweet Charity was responding to, ‘Observability is about being able to ask arbitrary questions about your environment without—and this is the key part—having to know ahead of time what you wanted to ask’.<span class="Apple-converted-space"> </span>This part, as it states, is key – ‘being able to ask arbitrary questions of the system without knowing what you may want to ask beforehand’.</p>
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<div class="wp-block-image size-full wp-image-1114 alignleft"><figure class="alignleft"><img data-attachment-id="1114" data-permalink="https://sdarchitect.blog/2020/01/08/understanding-observability/f-35-cockpit/" data-orig-file="https://sdarchitect.blog/wp-content/uploads/2020/01/f-35-cockpit.jpg" data-orig-size="720,380" data-comments-opened="1" data-image-meta="{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"1"}" data-image-title="F-35-Cockpit" data-image-description="" data-image-caption="" data-large-file="https://sdarchitect.blog/wp-content/uploads/2020/01/f-35-cockpit.jpg?w=720" width="720" height="380" src="https://sdarchitect.blog/wp-content/uploads/2020/01/f-35-cockpit.jpg" alt="F-35-Cockpit" class="wp-image-1114" srcset="https://sdarchitect.blog/wp-content/uploads/2020/01/f-35-cockpit.jpg 720w, https://sdarchitect.blog/wp-content/uploads/2020/01/f-35-cockpit.jpg?w=150&h=79 150w, https://sdarchitect.blog/wp-content/uploads/2020/01/f-35-cockpit.jpg?w=300&h=158 300w" sizes="(max-width: 720px) 100vw, 720px" /><figcaption>F35 Cockpit. Image Source: Internet</figcaption></figure></div>
|
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||
<p class="wp-block-paragraph">A cockpit of an F35 fighter jet has dozens of widgets providing the pilot <i>Telemetry</i> about the aircraft and its operating environment. At any given moment the pilot can see what is happening in the jet, and with radar and other sensors even around it. But she cannot ask the console to provide her with answers to questions she needs answered which were not thought of beforehand. She can ask, ‘from my current position and heading, do I have enough fuel to get back to my carrier which is moving at 15 knots at a SSE heading’. She cannot though, pull a Tony Stark and have an free-form conversation with <i>J.A.R.V.I.S</i> in the Iron Man suit:</p>
|
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||
<blockquote class="wp-block-quote is-layout-flow wp-block-quote-is-layout-flow"><p>Tony: How many (people who have fallen out of Air Force One) in the air?”</p><p>J.A.R.V.I.S.: Thirteen, sir.”</p><p>Tony: How many can I carry?”</p><p>J.A.R.V.I.S.: Four, sir.”</p><p style="text-align:right;">– Source: <i>Iron Man 3</i></p></blockquote>
|
||
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||
<p class="wp-block-paragraph">What the F35 pilot has is <i>Telemetry</i>. Iron Man has <i>Observability</i>.</p>
|
||
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||
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|
||
<p class="wp-block-paragraph">Going back to my client, they too have just Telemetry. In fact, great telemetry. But not Observability. If they want to understand the state of the system at any given time, they can only make <i>assumptions </i>of the state based on all the telemetry data they are gathering. ‘No SLI is outside its pre-determined threshold, all must be healthy’. They can ask, ‘which service was the performing slower than average when the last flight to Sydney from Dallas was boarded and closed’. They can do root cause analysis of an outage by asking which services were impacted. They cannot however ask, ‘find me all the iOS Mobile App users on iOS version 13.x who were unable to load the seat map for Boeing 777-300ER aircraft while checking-in to their flight to Sydney today’, similar to what Charity wants to ask in her seminal <a href="https://www.honeycomb.io/blog/so-you-want-to-build-an-observability-tool/" target="_blank" rel="noopener">blog post</a><span class="s2"> </span><span class="s3">on this topic. You cannot ask this question because you did not set up monitoring to get the right data, and more importantly you do not have the tracing capability to trace the series of events (failed seat map load while checking-in) thru the system across multiple dimensions (user’s app type, OS version, Aircraft type) that would be needed to answer the question. Because you did not know beforehand that you would need to ask this question. Hence, you have <i>Telemetry</i>, not <i>Observability</i>.</span></p>
|
||
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||
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<p class="wp-block-paragraph">To quote Charity again:</p>
|
||
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<blockquote class="wp-block-quote is-style-default is-layout-flow wp-block-quote-is-layout-flow"><p><i>Observability requires methodical, iterative exploration of the evidence. You can’t just use your gut and a dashboard and leap to a conclusion. The system is too complicated, too messy, too unpredictable. Your gut remembers what caused yesterday’s outages, it cannot predict the cause of tomorrow’s.</i></p></blockquote>
|
||
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||
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||
<p class="wp-block-paragraph">For more detail, I refer you back to her post.</p>
|
||
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||
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||
<p class="wp-block-paragraph">I am at a much higher plane of understanding of <i>Observability</i> today thanks to <a rel="noopener" href="https://twitter.com/mipsytipsy" target="_blank">@mipsytipsy</a>. Keep sharing the knowledge Charity!</p>
|
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<p class="wp-block-paragraph">I would love to talk more about Observability, both with people learning about it, and those implementing it (or planning to do so). </p>
|
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||
<ul class="wp-block-list"><li>What are your use cases? </li><li>What tools are you using/evaluating? </li><li>What business value do you expect to extract? How are you building the business case? </li><li>What organizational and cultural change do you need to become effective? </li></ul>
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<p class="wp-block-paragraph">Happy share more of my thoughts and experiences, if you want to have a chat. Leave a comment below or hit me up at <a href="mailto:sanjeev@sdarchitect.blog">sanjeev@sdarchitect.blog</a>. </p>
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<div class="wp-block-group"><div class="wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow">
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<blockquote class="wp-block-quote is-style-large is-layout-flow wp-block-quote-is-layout-flow"><p>— Sanjeev Sharma</p><cite><em><strong>Principal Analyst, <a href="https://accelst.com/">accelerated strategies</a></strong></em></cite></blockquote>
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<span class="avatar-container"><img referrerpolicy="no-referrer" alt='Niladri Choudhuri's avatar' src='https://1.gravatar.com/avatar/dc08a8bd2c51b867e77090b17a52ee3620e8e08136e2ca60b5eb2e4665e689fb?s=100&d=identicon&r=G' srcset='https://1.gravatar.com/avatar/dc08a8bd2c51b867e77090b17a52ee3620e8e08136e2ca60b5eb2e4665e689fb?s=100&d=identicon&r=G 1x, https://1.gravatar.com/avatar/dc08a8bd2c51b867e77090b17a52ee3620e8e08136e2ca60b5eb2e4665e689fb?s=150&d=identicon&r=G 1.5x, https://1.gravatar.com/avatar/dc08a8bd2c51b867e77090b17a52ee3620e8e08136e2ca60b5eb2e4665e689fb?s=200&d=identicon&r=G 2x, https://1.gravatar.com/avatar/dc08a8bd2c51b867e77090b17a52ee3620e8e08136e2ca60b5eb2e4665e689fb?s=300&d=identicon&r=G 3x, https://1.gravatar.com/avatar/dc08a8bd2c51b867e77090b17a52ee3620e8e08136e2ca60b5eb2e4665e689fb?s=400&d=identicon&r=G 4x' class='avatar avatar-100' height='100' width='100' loading='lazy' decoding='async' /></span> <cite class="fn">Niladri Choudhuri</cite> <span class="says">says:</span> </div>
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<a href="https://sdarchitect.blog/2020/01/08/understanding-observability/#comment-22341">January 9, 2020 at 5:34 am</a> </div>
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<p>Great Article. This brings a point to my mind. Observability has to be architected.</p>
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