Setup instructions for Prometheus.

hc/front/templatetags/hc_extras.py

@@ -40,6 +40,19 @@ def site_root():
     return settings.SITE_ROOT
 
 
+@register.simple_tag
+def site_scheme():
+    parts = settings.SITE_ROOT.split("://")
+    assert parts[0] in ("http", "https")
+    return parts[0]
+
+
+@register.simple_tag
+def site_hostname():
+    parts = settings.SITE_ROOT.split("://")
+    return parts[1]
+
+
 @register.simple_tag
 def site_version():
     return settings.VERSION

hc/front/urls.py

@@ -49,6 +49,7 @@ channel_urls = [
     path("add_matrix/", views.add_matrix, name="hc-add-matrix"),
     path("add_apprise/", views.add_apprise, name="hc-add-apprise"),
     path("add_msteams/", views.add_msteams, name="hc-add-msteams"),
+    path("add_prometheus/", views.add_prometheus, name="hc-add-prometheus"),
     path("<uuid:code>/checks/", views.channel_checks, name="hc-channel-checks"),
     path("<uuid:code>/name/", views.update_channel_name, name="hc-channel-name"),
     path("<uuid:code>/test/", views.send_test_notification, name="hc-channel-test"),
@@ -70,11 +71,8 @@ urlpatterns = [
     path("projects/<uuid:code>/checks/add/", views.add_check, name="hc-add-check"),
     path("checks/cron_preview/", views.cron_preview),
     path("projects/<uuid:code>/checks/status/", views.status, name="hc-status"),
-    path(
-        "projects/<uuid:code>/checks/metrics/<slug:key>",
-        views.metrics,
-        name="hc-metrics",
-    ),
+    path("projects/<uuid:code>/checks/metrics/<slug:key>", views.metrics,),
+    path("projects/<uuid:code>/metrics/<slug:key>", views.metrics, name="hc-metrics",),
     path("checks/<uuid:code>/", include(check_urls)),
     path("integrations/", include(channel_urls)),
     path("docs/", views.serve_doc, name="hc-docs"),

hc/front/views.py

@@ -1542,6 +1542,12 @@ def add_msteams(request):
     return render(request, "integrations/add_msteams.html", ctx)
 
 
+@login_required
+def add_prometheus(request):
+    ctx = {"page": "channels", "project": request.project}
+    return render(request, "integrations/add_prometheus.html", ctx)
+
+
 def metrics(request, code, key):
     if len(key) != 32:
         return HttpResponseBadRequest()

templates/front/channels.html

@@ -291,6 +291,16 @@
             <a href="{% url 'hc-add-pagertree' %}" class="btn btn-primary">Add Integration</a>
         </li>
 
+        <li>
+            <img src="{% static 'img/integrations/prometheus.png' %}"
+                class="icon" alt="Prometheus icon" />
+
+            <h2>Prometheus</h2>
+            <p>Export check and tag status values to Prometheus.</p>
+
+            <a href="{% url 'hc-add-prometheus' %}" class="btn btn-primary">Add Integration</a>
+        </li>
+
         {% if enable_pushbullet %}
         <li>
             <img src="{% static 'img/integrations/pushbullet.png' %}"

templates/integrations/add_prometheus.html

@@ -0,0 +1,72 @@
+{% extends "base.html" %}
+{% load humanize static hc_extras %}
+
+{% block title %}Add Prometheus - {% site_name %}{% endblock %}
+
+
+{% block content %}
+<div class="row">
+  <div class="col-sm-12">
+      <h1>Prometheus</h1>
+
+      <p>
+          {% site_name %} provides a
+          <a href="https://prometheus.io">Prometheus</a>-compatible metrics endpoint
+          for each project. The endpoints are secured using each project's
+          read-only API key.
+
+          If your team uses Prometheus, you can configure it to scrape {% site_name %}
+          and have up-to-date check and tag status values available in Prometheus.
+      </p>
+
+      <h2>Setup Guide</h2>
+
+      <div class="row ai-step">
+        <div class="col-sm-6">
+            <span class="step-no">1</span>
+              <p>
+                Look up your project's read-only API key in
+                <strong>Project Settings › API Access</strong>.
+              </p>
+              <p>
+                If you have not generated API keys before, you will need to do that
+                first.
+            </p>
+        </div>
+        <div class="col-sm-6">
+          <img
+              class="ai-guide-screenshot"
+              alt="Click create integration button"
+              src="{% static 'img/integrations/setup_prometheus_1.png' %}" />
+        </div>
+      </div>
+
+      <div class="row ai-step">
+          <div class="col-sm-12">
+              <span class="step-no">2</span>
+                <p>
+                    Edit Prometheus configuration and add a new section in the
+                    <code>scrape_configs</code> section.
+                </p>
+                <pre>
+- job_name: 'healthchecks-{{ project|slugify }}'
+  scheme: {% site_scheme %}
+  metrics_path: /projects/{{ project.code }}/metrics/<strong>YOUR-READ-ONLY-API-KEY</strong>
+  static_configs:
+  - targets: ['{% site_hostname %}']</pre>
+          </div>
+      </div>
+
+      <div class="row ai-step">
+        <div class="col-sm-6">
+            <span class="step-no">3</span>
+              <p>
+                Reload Prometheus' configuration. You should now start seeing
+                {% site_name %} data appear in Prometheus.
+              </p>
+        </div>
+      </div>
+
+  </div>
+</div>
+{% endblock %}