prometheus config: Support mixed http and https scraping

monitoring/prometheus.jsonnet

@@ -1,7 +1,11 @@
-local hosts = {
-  // name: ["host:port", role]
-  // See overview.jsonnet for role explanations.
-  mynode: ["localhost:8080", "replica"]
+local hosts_by_scheme = {
+  http: {
+    // name: ["host:port", role]
+    // See overview.jsonnet for role explanations.
+    mynode: ["localhost:8080", "replica"]
+  },
+  https: {
+  },
 };
 local services = [
   "restreamer",
@@ -22,23 +26,28 @@ local services = [
     {
       job_name: "prometheus",
       static_configs: [
-        {targets: ["localhost:9090"], labels: {instance: "prometheus"}}
+        {targets: ["localhost:9090"], labels: {instance: "prometheus", service: "prometheus"}},
       ],
     },
-  ] + [
-    {
-      job_name: service,
-      metrics_path: "/metrics/%s" % service,
-      static_configs: [
-        {
-          targets: [hosts[host][0]],
-          labels: {
-            instance: host,
-            role: hosts[host][1],
-          },
-        } for host in std.objectFields(hosts)
-      ],
-    }
-    for service in services
-  ],
+  ] + std.flattenArrays([
+    [
+      {
+        local hosts = hosts_by_scheme[scheme],
+        job_name: "%s-%s" % [scheme, service],
+        metrics_path: "/metrics/%s" % service,
+        scheme: scheme,
+        static_configs: [
+          {
+            targets: [hosts[host][0]],
+            labels: {
+              instance: host,
+              role: hosts[host][1],
+            },
+          } for host in std.objectFields(hosts)
+        ],
+      }
+      for service in services
+    ]
+    for scheme in std.objectFields(hosts_by_scheme)
+  ]),
 }