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<h2 class="breadcrumbs-sub-title"><a href="/help/administration/monitoring/performance/index.md">Help</a></h2>
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<h1 dir="auto">
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<a aria-hidden="true" class="anchor" href="#gitlab-performance-monitoring" id="user-content-gitlab-performance-monitoring"></a>GitLab Performance Monitoring</h1>
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<p dir="auto">GitLab comes with its own application performance measuring system as of GitLab
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8.4, simply called "GitLab Performance Monitoring". GitLab Performance Monitoring is available in both the
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Community and Enterprise editions.</p>
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<p dir="auto">Apart from this introduction, you are advised to read through the following
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documents in order to understand and properly configure GitLab Performance Monitoring:</p>
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<ul dir="auto">
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<li><a href="/gitlab_configuration.md">GitLab Configuration</a></li>
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<li><a href="/influxdb_configuration.md">InfluxDB Install/Configuration</a></li>
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<li><a href="/influxdb_schema.md">InfluxDB Schema</a></li>
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<li><a href="/grafana_configuration.md">Grafana Install/Configuration</a></li>
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<li><a href="/performance_bar.md">Performance bar</a></li>
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<li><a href="/request_profiling.md">Request profiling</a></li>
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</ul>
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<blockquote dir="auto">
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<p><strong>Note:</strong>
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Omnibus GitLab 8.16 includes Prometheus as an additional tool to collect
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metrics. It will eventually replace InfluxDB when their metrics collection is
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on par. Read more in the <a href="/prometheus/index.md">Prometheus documentation</a>.</p>
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</blockquote>
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<h2 dir="auto">
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<a aria-hidden="true" class="anchor" href="#introduction-to-gitlab-performance-monitoring" id="user-content-introduction-to-gitlab-performance-monitoring"></a>Introduction to GitLab Performance Monitoring</h2>
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<p dir="auto">GitLab Performance Monitoring makes it possible to measure a wide variety of statistics
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including (but not limited to):</p>
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<ul dir="auto">
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<li>The time it took to complete a transaction (a web request or Sidekiq job).</li>
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<li>The time spent in running SQL queries and rendering HAML views.</li>
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<li>The time spent executing (instrumented) Ruby methods.</li>
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<li>Ruby object allocations, and retained objects in particular.</li>
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<li>System statistics such as the process' memory usage and open file descriptors.</li>
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<li>Ruby garbage collection statistics.</li>
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</ul>
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<p dir="auto">Metrics data is written to <a href="https://influxdata.com/time-series-platform/influxdb/" rel="nofollow noreferrer noopener" target="_blank">InfluxDB</a> over <a href="https://docs.influxdata.com/influxdb/v0.9/write_protocols/udp/" rel="nofollow noreferrer noopener" target="_blank">UDP</a>. Stored
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data can be visualized using <a href="http://grafana.org/" rel="nofollow noreferrer noopener" target="_blank">Grafana</a> or any other application that
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supports reading data from InfluxDB. Alternatively data can be queried using the
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InfluxDB CLI.</p>
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<h2 dir="auto">
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<a aria-hidden="true" class="anchor" href="#metric-types" id="user-content-metric-types"></a>Metric Types</h2>
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<p dir="auto">Two types of metrics are collected:</p>
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<ol dir="auto">
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<li>Transaction specific metrics.</li>
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<li>Sampled metrics, collected at a certain interval in a separate thread.</li>
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</ol>
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<h3 dir="auto">
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<a aria-hidden="true" class="anchor" href="#transaction-metrics" id="user-content-transaction-metrics"></a>Transaction Metrics</h3>
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<p dir="auto">Transaction metrics are metrics that can be associated with a single
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transaction. This includes statistics such as the transaction duration, timings
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of any executed SQL queries, time spent rendering HAML views, etc. These metrics
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are collected for every Rack request and Sidekiq job processed.</p>
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<h3 dir="auto">
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<a aria-hidden="true" class="anchor" href="#sampled-metrics" id="user-content-sampled-metrics"></a>Sampled Metrics</h3>
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<p dir="auto">Sampled metrics are metrics that can't be associated with a single transaction.
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Examples include garbage collection statistics and retained Ruby objects. These
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metrics are collected at a regular interval. This interval is made up out of two
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parts:</p>
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<ol dir="auto">
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<li>A user defined interval.</li>
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<li>A randomly generated offset added on top of the interval, the same offset
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can't be used twice in a row.</li>
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</ol>
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<p dir="auto">The actual interval can be anywhere between a half of the defined interval and a
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half above the interval. For example, for a user defined interval of 15 seconds
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the actual interval can be anywhere between 7.5 and 22.5. The interval is
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re-generated for every sampling run instead of being generated once and re-used
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for the duration of the process' lifetime.</p>
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</div>
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</div>
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</div>
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</div>
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</div>
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</body>
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</html>
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