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<metaname="description" content="Full Stack Python shows how an entire Python web application is built and deployed. Each section of the guide explains a different key concept, from the server through the Python WSGI web framework to the front end JavaScript.">
<metaname="author" content="Matt Makai">
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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>
<olclass="arabic simple">
<li>CPU utilization</li>
<li>Memory utilization</li>
<li>Persistence storage consumed versus free</li>
<li>Network bandwidth and latency</li>
</ol>
<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>
<olclass="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>
</ol>
<divclass="section" id="monitoring-third-party-services">
<h2>Monitoring Third Party Services</h2>
<p><aclass="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><aclass="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><aclass="reference external" href="http://status.io/">Status.io</a> focuses on uptime and response metrics
transparency for your users.</p>
<p><aclass="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>
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<divclass="section" id="open-source-projects">
<h2>Open Source Projects</h2>
<p><aclass="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><aclass="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><aclass="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><aclass="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>
<divclass="section" id="monitoring-resources">
<h2>Monitoring Resources</h2>
<p><aclass="reference external" href="http://www.paperplanes.de/2011/1/5/the_virtues_of_monitoring.html">The Virtues of Monitoring</a></p>
<p><aclass="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;<aclass="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><aclass="reference external" href="http://aarvik.dk/four-linux-server-monitoring-and-management-tools/">Four Linux server monitoring tools</a></p>
<p><aclass="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>
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 Next read the
<ahref="/web-analytics.html">web analytics</a> section.

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<ahref="/introduction.html" class="list-group-item ">Introduction</a>
<ahref="/servers.html" class="list-group-item ">Servers</a>
<ahref="/operating-systems.html" class="list-group-item ">Operating Systems</a>
<ahref="/web-servers.html" class="list-group-item ">Web Servers</a>
<ahref="/platform-as-a-service.html" class="list-group-item ">Platform-as-a-service</a>
<ahref="/databases.html" class="list-group-item ">Databases</a>
<ahref="/wsgi-servers.html" class="list-group-item ">WSGI Servers</a>
<ahref="/web-frameworks.html" class="list-group-item ">Web Frameworks</a>
<ahref="/task-queues.html" class="list-group-item ">Task Queues</a>
<ahref="/static-content.html" class="list-group-item ">Static Content</a>
<ahref="/caching.html" class="list-group-item ">Caching</a>
<ahref="/web-browsers.html" class="list-group-item ">Web Browsers</a>
<ahref="/web-application-security.html" class="list-group-item ">Web Application Security</a>
<ahref="/monitoring.html" class="list-group-item active">Monitoring</a>
<ahref="/web-analytics.html" class="list-group-item ">Web Analytics</a>
<ahref="/api-integration.html" class="list-group-item ">API Integration</a>
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<ahref="/configuration-management.html" class="list-group-item ">Configuration Management</a>
<ahref="/dependency-management.html" class="list-group-item ">Application Dependencies</a>
<ahref="/no-sql-datastore.html" class="list-group-item ">NoSQL Data Stores</a>
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