Prometheus exporter

k8s/deployment.yml

@@ -26,6 +26,7 @@ spec:
         image: dps:latest
         ports:
           - containerPort: 4000
+          - containerPort: 9568
         env:
           - name: LANG
             value: C.UTF-8

k8s/svc.yml

@@ -18,5 +18,7 @@ spec:
   ports:
   - name: http
     port: 4000
+  - name: metrics
+    port: 9568
   selector:
     app: dps

lib/dps_web/router.ex

@@ -20,8 +20,7 @@ defmodule DpsWeb.Router do
 
   # Authenticated Browser pages
   scope "/", DpsWeb do
-    pipe_through :browser
-    pipe_through :auth
+    pipe_through [:browser, :auth]
 
     get "/authors/new", AuthorPageController, :new
     post "/authors/new", AuthorPageController, :create
@@ -57,8 +56,7 @@ defmodule DpsWeb.Router do
 
   # Authenticated api
   scope "/api", DpsWeb do
-    pipe_through :api
-    pipe_through :auth
+    pipe_through [:api, :auth]
 
     post "/authors", AuthorController, :create
     post "/poems", PoemController, :create

lib/dps_web/telemetry.ex

@@ -11,9 +11,10 @@ defmodule DpsWeb.Telemetry do
     children = [
       # Telemetry poller will execute the given period measurements
       # every 10_000ms. Learn more here: https://hexdocs.pm/telemetry_metrics
-      {:telemetry_poller, measurements: periodic_measurements(), period: 10_000}
-      # Add reporters as children of your supervision tree.
-      # {Telemetry.Metrics.ConsoleReporter, metrics: custom_metrics()}
+      {:telemetry_poller, measurements: periodic_measurements(), period: 10_000},
+      # Add reporters as children of your supervision tree
+      {TelemetryMetricsPrometheus, [metrics: metrics()]},
+      # {Telemetry.Metrics.ConsoleReporter, metrics: custom_metrics()},
     ]
 
     Supervisor.init(children, strategy: :one_for_one)

mix.exs

@@ -43,6 +43,7 @@ defmodule Dps.MixProject do
       {:phoenix_live_dashboard, "~> 0.4"},
       {:telemetry_metrics, "~> 0.4"},
       {:telemetry_poller, "~> 0.4"},
+      {:telemetry_metrics_prometheus, "~> 0.6.0"},
       {:jason, "~> 1.0"},
       {:plug_cowboy, "~> 2.0"},
       {:peerage, "~> 1.0"},

mix.lock

@@ -30,5 +30,7 @@
   "table_rex": {:hex, :table_rex, "3.0.0", "5189b71b3b92ed461358f40f7b7b630dc37716bf6c8ab3e934b2bc63a99028bd", [:mix], [], "hexpm", "582776d24cbe6a4d30a39a7f02035b1bc979b6cd64923d7234dd2f0ad21a18c7"},
   "telemetry": {:hex, :telemetry, "0.4.2", "2808c992455e08d6177322f14d3bdb6b625fbcfd233a73505870d8738a2f4599", [:rebar3], [], "hexpm", "2d1419bd9dda6a206d7b5852179511722e2b18812310d304620c7bd92a13fcef"},
   "telemetry_metrics": {:hex, :telemetry_metrics, "0.6.0", "da9d49ee7e6bb1c259d36ce6539cd45ae14d81247a2b0c90edf55e2b50507f7b", [:mix], [{:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "5cfe67ad464b243835512aa44321cee91faed6ea868d7fb761d7016e02915c3d"},
+  "telemetry_metrics_prometheus": {:hex, :telemetry_metrics_prometheus, "0.6.0", "04148a77a1ab1d46d899627f6ecca8005477ae620b1a81116dce2eaeb4a3bff8", [:mix], [{:plug_cowboy, "~> 2.1", [hex: :plug_cowboy, repo: "hexpm", optional: false]}, {:telemetry_metrics_prometheus_core, "~> 0.4", [hex: :telemetry_metrics_prometheus_core, repo: "hexpm", optional: false]}], "hexpm", "b26be99ee4f977635f4b7f8a0c9be27672a0d6b22057ab3d48fbd1d5738346d8"},
+  "telemetry_metrics_prometheus_core": {:hex, :telemetry_metrics_prometheus_core, "0.4.2", "9c5b2cce20222f3c16256dcd6cfaf59d05a84dc664060ab938c6ac40e91d05e0", [:mix], [{:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}, {:telemetry_metrics, "~> 0.5", [hex: :telemetry_metrics, repo: "hexpm", optional: false]}], "hexpm", "9cd707328a1971c886993f3e4b22c68835153efa674bf31a957b30439de9b258"},
   "telemetry_poller": {:hex, :telemetry_poller, "0.5.1", "21071cc2e536810bac5628b935521ff3e28f0303e770951158c73eaaa01e962a", [:rebar3], [{:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "4cab72069210bc6e7a080cec9afffad1b33370149ed5d379b81c7c5f0c663fd4"},
 }