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<h1>Monitoring</h1>

<p>Capturing and analyzing data about your production environment is critical

to proactively deal with stability, performance, and errors in a web

application.</p>

<p>There are several important resources to monitor on the operating system

and network level of a web stack.</p>

<ol class="arabic simple">

<li>CPU utilization</li>

<li>Memory utilization</li>

<li>Persistence storage consumed versus free</li>

<li>Network bandwidth and latency</li>

<p>Application level monitoring encompasses several aspects. The amount of time

and resources dedicated to each aspect will vary based on whether an

application is read-heavy, write-heavy, or subject to rapid swings in traffic.</p>

<ol class="arabic simple">

<li>Application warnings and errors (500-level HTTP errors)</li>

<li>Application code performance</li>

<li>Template rendering time</li>

<li>Browser rendering time for the application</li>

<li>Database querying performance</li>

<div class="section" id="monitoring-third-party-services">

<h2>Monitoring Third Party Services</h2>

<p><a class="reference external" href="http://newrelic.com/">New Relic</a>. Application and database monitoring as

well as plug ins for capturing and analyzing additional data about tools in

your stack.</p>

<p><a class="reference external" href="http://copperegg.com/">CopperEgg</a> is lower-level monitoring on server and

infrastructure. It's popular with DevOps shops that are making changes to

their production environments and want immediate feedback on the results

of those modifications.</p>

<p><a class="reference external" href="http://status.io/">Status.io</a> focuses on uptime and response metrics

transparency for your users.</p>

<p><a class="reference external" href="http://www.pagerduty.com/">PagerDuty</a> alerts a designated person or group

if there are stability, performance, or uptime issues with an application.</p>

<div class="section" id="open-source-projects">

<h2>Open Source Projects</h2>

<p><a class="reference external" href="https://github.com/etsy/statsd/">statsd</a> is a node.js network daemon that

listens for metrics and aggregates them for transfer into another service

such as Graphite.</p>

<p><a class="reference external" href="https://graphite.readthedocs.org/en/latest/overview.html">Graphite</a> stores

time-series data and displays them in graphs through a Django web application.</p>

<p><a class="reference external" href="http://sensuapp.org/">Sensu</a> is an open source monitoring framework

written in Ruby but applicable to any programming language web application.</p>

<p><a class="reference external" href="http://vimeo.github.io/graph-explorer/">Graph Explorer</a> by Vimeo is a

Graphite-based dashboard with added features and a slick design.</p>

<div class="section" id="monitoring-resources">

<h2>Monitoring Resources</h2>

<p><a class="reference external" href="http://www.paperplanes.de/2011/1/5/the_virtues_of_monitoring.html">The Virtues of Monitoring</a></p>

<p><a class="reference external" href="http://blog.docker.io/2013/07/effortless-monitoring-with-collectd-graphite-and-docker/">Effortless Monitoring with collectd, Graphite, and Docker</a></p>

<p>Bit.ly describes the &quot;<a class="reference external" href="http://word.bitly.com/post/74839060954/ten-things-to-monitor">10 Things We Forgot to Monitor</a>&quot;

beyond the standard metrics such as disk &amp; memory usage.</p>

<p><a class="reference external" href="http://aarvik.dk/four-linux-server-monitoring-and-management-tools/">Four Linux server monitoring tools</a></p>

<p><a class="reference external" href="https://blog.serverdensity.com/how-to-design-useful-monitoring-graphs-and-visualizations/">How to design useful monitoring and graphing visualizations</a></p>

<br/>

Next read the

<a href="/web-analytics.html">web analytics</a> section.

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<a href="/introduction.html" class="list-group-item ">Introduction</a>

<a href="/servers.html" class="list-group-item ">Servers</a>

<a href="/operating-systems.html" class="list-group-item ">Operating Systems</a>

<a href="/web-servers.html" class="list-group-item ">Web Servers</a>

<a href="/platform-as-a-service.html" class="list-group-item ">Platform-as-a-service</a>

<a href="/databases.html" class="list-group-item ">Databases</a>

<a href="/wsgi-servers.html" class="list-group-item ">WSGI Servers</a>

<a href="/web-frameworks.html" class="list-group-item ">Web Frameworks</a>

<a href="/task-queues.html" class="list-group-item ">Task Queues</a>

<a href="/static-content.html" class="list-group-item ">Static Content</a>

<a href="/caching.html" class="list-group-item ">Caching</a>

<a href="/web-browsers.html" class="list-group-item ">Web Browsers</a>

<a href="/web-application-security.html" class="list-group-item ">Web Application Security</a>

<a href="/monitoring.html" class="list-group-item active">Monitoring</a>

<a href="/web-analytics.html" class="list-group-item ">Web Analytics</a>

<a href="/third-party-services.html" class="list-group-item ">Third Party Services</a>

<a href="/source-control.html" class="list-group-item ">Source Control</a>

<a href="/configuration-management.html" class="list-group-item ">Configuration Management</a>

<a href="/dependency-management.html" class="list-group-item ">Application Dependencies</a>

<a href="/no-sql-datastore.html" class="list-group-item ">NoSQL Data Stores</a>

<a href="/about-author.html" class="list-group-item ">About</a>

<a href="/change-log.html" class="list-group-item ">Change Log</a>

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