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<p>This mounts the <code>/metrics</code> endpoint that Prometheus can scrape.</p>
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<h2 id="declaring-metrics">Declaring metrics<a class="headerlink" href="#declaring-metrics" title="Permanent link">¶</a></h2>
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<h3 id="providers">Providers<a class="headerlink" href="#providers" title="Permanent link">¶</a></h3>
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<p>Providers are called once at startup and register metrics that are updated externally (e.g. counters, histograms):</p>
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<p>Providers are called once at startup by <code>init_metrics</code>. The return value (the Prometheus metric object) is stored in the registry and can be retrieved later with <a href="../../reference/metrics/#fastapi_toolsets.metrics.registry.MetricsRegistry.get"><code>registry.get(name)</code></a>.</p>
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<p>Use providers when you want <strong>deferred initialization</strong>: the Prometheus metric is not registered with the global <code>CollectorRegistry</code> until <code>init_metrics</code> runs, not at import time. This is particularly useful for testing — importing the module in a test suite without calling <code>init_metrics</code> leaves no metrics registered, avoiding cross-test pollution.</p>
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<p>It is also useful when metrics are defined across multiple modules and merged with <code>include_registry</code>: any code that needs a metric can call <code>metrics.get()</code> on the shared registry instead of importing the metric directly from its origin module.</p>
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<p>If neither of these applies to you, declaring metrics at module level (e.g. <code>HTTP_REQUESTS = Counter(...)</code>) is simpler and equally valid.</p>
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<div class="language-python highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">prometheus_client</span><span class="w"> </span><span class="kn">import</span> <span class="n">Counter</span><span class="p">,</span> <span class="n">Histogram</span>
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</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>
|
||||
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="nd">@metrics</span><span class="o">.</span><span class="n">register</span>
|
||||
@@ -1642,21 +1778,36 @@ version.
|
||||
</span><span id="__span-3-8"><a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a><span class="k">def</span><span class="w"> </span><span class="nf">request_duration</span><span class="p">():</span>
|
||||
</span><span id="__span-3-9"><a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a> <span class="k">return</span> <span class="n">Histogram</span><span class="p">(</span><span class="s2">"request_duration_seconds"</span><span class="p">,</span> <span class="s2">"Request duration"</span><span class="p">)</span>
|
||||
</span></code></pre></div>
|
||||
<p>To use a provider's metric elsewhere (e.g. in a middleware), call <code>metrics.get()</code> inside the handler — <strong>not</strong> at module level, as providers are only initialized when <code>init_metrics</code> runs:</p>
|
||||
<div class="language-python highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">metrics_middleware</span><span class="p">(</span><span class="n">request</span><span class="p">:</span> <span class="n">Request</span><span class="p">,</span> <span class="n">call_next</span><span class="p">):</span>
|
||||
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a> <span class="n">response</span> <span class="o">=</span> <span class="k">await</span> <span class="n">call_next</span><span class="p">(</span><span class="n">request</span><span class="p">)</span>
|
||||
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a> <span class="n">metrics</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"http_requests"</span><span class="p">)</span><span class="o">.</span><span class="n">labels</span><span class="p">(</span>
|
||||
</span><span id="__span-4-4"><a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a> <span class="n">method</span><span class="o">=</span><span class="n">request</span><span class="o">.</span><span class="n">method</span><span class="p">,</span> <span class="n">status</span><span class="o">=</span><span class="n">response</span><span class="o">.</span><span class="n">status_code</span>
|
||||
</span><span id="__span-4-5"><a id="__codelineno-4-5" name="__codelineno-4-5" href="#__codelineno-4-5"></a> <span class="p">)</span><span class="o">.</span><span class="n">inc</span><span class="p">()</span>
|
||||
</span><span id="__span-4-6"><a id="__codelineno-4-6" name="__codelineno-4-6" href="#__codelineno-4-6"></a> <span class="k">return</span> <span class="n">response</span>
|
||||
</span></code></pre></div>
|
||||
<h3 id="collectors">Collectors<a class="headerlink" href="#collectors" title="Permanent link">¶</a></h3>
|
||||
<p>Collectors are called on every scrape. Use them for metrics that reflect current state (e.g. gauges):</p>
|
||||
<div class="language-python highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="nd">@metrics</span><span class="o">.</span><span class="n">register</span><span class="p">(</span><span class="n">collect</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
|
||||
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a><span class="k">def</span><span class="w"> </span><span class="nf">queue_depth</span><span class="p">():</span>
|
||||
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a> <span class="n">gauge</span> <span class="o">=</span> <span class="n">Gauge</span><span class="p">(</span><span class="s2">"queue_depth"</span><span class="p">,</span> <span class="s2">"Current queue depth"</span><span class="p">)</span>
|
||||
</span><span id="__span-4-4"><a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a> <span class="n">gauge</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="n">get_current_queue_depth</span><span class="p">())</span>
|
||||
<p>Collectors are called on every scrape. Use them for metrics that reflect current state (e.g. gauges).</p>
|
||||
<div class="admonition warning">
|
||||
<p class="admonition-title">Declare the metric at module level</p>
|
||||
<p>Do <strong>not</strong> instantiate the Prometheus metric inside the collector function. Doing so recreates it on every scrape, raising <code>ValueError: Duplicated timeseries in CollectorRegistry</code>. Declare it once at module level instead:</p>
|
||||
</div>
|
||||
<div class="language-python highlight"><pre><span></span><code><span id="__span-5-1"><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">prometheus_client</span><span class="w"> </span><span class="kn">import</span> <span class="n">Gauge</span>
|
||||
</span><span id="__span-5-2"><a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a>
|
||||
</span><span id="__span-5-3"><a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a><span class="n">_queue_depth</span> <span class="o">=</span> <span class="n">Gauge</span><span class="p">(</span><span class="s2">"queue_depth"</span><span class="p">,</span> <span class="s2">"Current queue depth"</span><span class="p">)</span>
|
||||
</span><span id="__span-5-4"><a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a>
|
||||
</span><span id="__span-5-5"><a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a><span class="nd">@metrics</span><span class="o">.</span><span class="n">register</span><span class="p">(</span><span class="n">collect</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
|
||||
</span><span id="__span-5-6"><a id="__codelineno-5-6" name="__codelineno-5-6" href="#__codelineno-5-6"></a><span class="k">def</span><span class="w"> </span><span class="nf">collect_queue_depth</span><span class="p">():</span>
|
||||
</span><span id="__span-5-7"><a id="__codelineno-5-7" name="__codelineno-5-7" href="#__codelineno-5-7"></a> <span class="n">_queue_depth</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="n">get_current_queue_depth</span><span class="p">())</span>
|
||||
</span></code></pre></div>
|
||||
<h2 id="merging-registries">Merging registries<a class="headerlink" href="#merging-registries" title="Permanent link">¶</a></h2>
|
||||
<p>Split metrics definitions across modules and merge them:</p>
|
||||
<div class="language-python highlight"><pre><span></span><code><span id="__span-5-1"><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">myapp.metrics.http</span><span class="w"> </span><span class="kn">import</span> <span class="n">http_metrics</span>
|
||||
</span><span id="__span-5-2"><a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a><span class="kn">from</span><span class="w"> </span><span class="nn">myapp.metrics.db</span><span class="w"> </span><span class="kn">import</span> <span class="n">db_metrics</span>
|
||||
</span><span id="__span-5-3"><a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a>
|
||||
</span><span id="__span-5-4"><a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a><span class="n">metrics</span> <span class="o">=</span> <span class="n">MetricsRegistry</span><span class="p">()</span>
|
||||
</span><span id="__span-5-5"><a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a><span class="n">metrics</span><span class="o">.</span><span class="n">include_registry</span><span class="p">(</span><span class="n">registry</span><span class="o">=</span><span class="n">http_metrics</span><span class="p">)</span>
|
||||
</span><span id="__span-5-6"><a id="__codelineno-5-6" name="__codelineno-5-6" href="#__codelineno-5-6"></a><span class="n">metrics</span><span class="o">.</span><span class="n">include_registry</span><span class="p">(</span><span class="n">registry</span><span class="o">=</span><span class="n">db_metrics</span><span class="p">)</span>
|
||||
<div class="language-python highlight"><pre><span></span><code><span id="__span-6-1"><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">myapp.metrics.http</span><span class="w"> </span><span class="kn">import</span> <span class="n">http_metrics</span>
|
||||
</span><span id="__span-6-2"><a id="__codelineno-6-2" name="__codelineno-6-2" href="#__codelineno-6-2"></a><span class="kn">from</span><span class="w"> </span><span class="nn">myapp.metrics.db</span><span class="w"> </span><span class="kn">import</span> <span class="n">db_metrics</span>
|
||||
</span><span id="__span-6-3"><a id="__codelineno-6-3" name="__codelineno-6-3" href="#__codelineno-6-3"></a>
|
||||
</span><span id="__span-6-4"><a id="__codelineno-6-4" name="__codelineno-6-4" href="#__codelineno-6-4"></a><span class="n">metrics</span> <span class="o">=</span> <span class="n">MetricsRegistry</span><span class="p">()</span>
|
||||
</span><span id="__span-6-5"><a id="__codelineno-6-5" name="__codelineno-6-5" href="#__codelineno-6-5"></a><span class="n">metrics</span><span class="o">.</span><span class="n">include_registry</span><span class="p">(</span><span class="n">registry</span><span class="o">=</span><span class="n">http_metrics</span><span class="p">)</span>
|
||||
</span><span id="__span-6-6"><a id="__codelineno-6-6" name="__codelineno-6-6" href="#__codelineno-6-6"></a><span class="n">metrics</span><span class="o">.</span><span class="n">include_registry</span><span class="p">(</span><span class="n">registry</span><span class="o">=</span><span class="n">db_metrics</span><span class="p">)</span>
|
||||
</span></code></pre></div>
|
||||
<h2 id="multi-process-mode">Multi-process mode<a class="headerlink" href="#multi-process-mode" title="Permanent link">¶</a></h2>
|
||||
<p>Multi-process support is enabled automatically when the <code>PROMETHEUS_MULTIPROC_DIR</code> environment variable is set. No code changes are required.</p>
|
||||
@@ -1772,7 +1923,7 @@ version.
|
||||
<script id="__config" type="application/json">{"annotate":null,"base":"../..","features":["announce.dismiss","content.action.view","content.code.annotate","content.code.copy","content.code.select","content.footnote.tooltips","content.tabs.link","content.tooltips","navigation.footer","navigation.indexes","navigation.instant","navigation.instant.prefetch","navigation.path","navigation.sections","navigation.tabs","navigation.top","navigation.tracking","search.highlight"],"search":"../../assets/javascripts/workers/search.e2d2d235.min.js","tags":null,"translations":{"clipboard.copied":"Copied to clipboard","clipboard.copy":"Copy to clipboard","search.result.more.one":"1 more on this page","search.result.more.other":"# more on this page","search.result.none":"No matching documents","search.result.one":"1 matching document","search.result.other":"# matching documents","search.result.placeholder":"Type to start searching","search.result.term.missing":"Missing","select.version":"Select version"},"version":{"alias":true,"default":"stable","provider":"mike"}}</script>
|
||||
|
||||
|
||||
<script src="../../assets/javascripts/bundle.66be65ca.min.js"></script>
|
||||
<script src="../../assets/javascripts/bundle.91a19a9e.min.js"></script>
|
||||
|
||||
|
||||
</body>
|
||||
|
||||
Reference in New Issue
Block a user