prometheus config: Support mixed http and https scraping

monitoring/prometheus.jsonnet

@@ -1,7 +1,11 @@
-local hosts = {
+local hosts_by_scheme = {
+  http: {
     // name: ["host:port", role]
     // See overview.jsonnet for role explanations.
     mynode: ["localhost:8080", "replica"]
+  },
+  https: {
+  },
 };
 local services = [
   "restreamer",
@@ -22,13 +26,16 @@ local services = [
     {
       job_name: "prometheus",
       static_configs: [
-        {targets: ["localhost:9090"], labels: {instance: "prometheus"}}
+        {targets: ["localhost:9090"], labels: {instance: "prometheus", service: "prometheus"}},
       ],
     },
-  ] + [
+  ] + std.flattenArrays([
+    [
       {
-      job_name: service,
+        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]],
@@ -40,5 +47,7 @@ local services = [
         ],
       }
       for service in services
-  ],
+    ]
+    for scheme in std.objectFields(hosts_by_scheme)
+  ]),
 }