Add prometheus metric for push count

lib/tusker_push/apns.ex

@@ -6,6 +6,8 @@ defmodule TuskerPush.Apns do
 
   @spec send(environment(), String.t(), Map.t()) :: :ok | {:error, term()}
   def send(apns_env, apns_device_token, payload) do
+    :telemetry.execute([:apns, :push], %{monotonic_time: System.monotonic_time()})
+
     OpenTelemetry.Tracer.with_span :apns_push, %{attributes: [env: apns_env]} do
       do_send(apns_env, apns_device_token, payload)
     end

lib/tusker_push_web/telemetry.ex

@@ -11,9 +11,10 @@ defmodule TuskerPushWeb.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}
+      # {:telemetry_poller, measurements: periodic_measurements(), period: 10_000},
       # Add reporters as children of your supervision tree.
       # {Telemetry.Metrics.ConsoleReporter, metrics: metrics()}
+      {TelemetryMetricsPrometheus, [metrics: prometheus_metrics()]}
     ]
 
     Supervisor.init(children, strategy: :one_for_one)
@@ -51,29 +52,6 @@ defmodule TuskerPushWeb.Telemetry do
         unit: {:native, :millisecond}
       ),
 
-      # Database Metrics
-      summary("tusker_push.repo.query.total_time",
-        unit: {:native, :millisecond},
-        description: "The sum of the other measurements"
-      ),
-      summary("tusker_push.repo.query.decode_time",
-        unit: {:native, :millisecond},
-        description: "The time spent decoding the data received from the database"
-      ),
-      summary("tusker_push.repo.query.query_time",
-        unit: {:native, :millisecond},
-        description: "The time spent executing the query"
-      ),
-      summary("tusker_push.repo.query.queue_time",
-        unit: {:native, :millisecond},
-        description: "The time spent waiting for a database connection"
-      ),
-      summary("tusker_push.repo.query.idle_time",
-        unit: {:native, :millisecond},
-        description:
-          "The time the connection spent waiting before being checked out for the query"
-      ),
-
       # VM Metrics
       summary("vm.memory.total", unit: {:byte, :kilobyte}),
       summary("vm.total_run_queue_lengths.total"),
@@ -82,6 +60,14 @@ defmodule TuskerPushWeb.Telemetry do
     ]
   end
 
+  # TODO: I would love to consolidate this with the OpenTelemetry stuff, but elixir metrics api is
+  # undocumented and "experimental"
+  defp prometheus_metrics do
+    [
+      counter("apns.push.count", event_name: [:apns, :push], measurement: :monotonic_time)
+    ]
+  end
+
   defp periodic_measurements do
     [
       # A module, function and arguments to be invoked periodically.

mix.exs

@@ -56,7 +56,8 @@ defmodule TuskerPush.MixProject do
       {:opentelemetry_bandit,
        git: "https://git.shadowfacts.net/shadowfacts/opentelemetry-erlang-contrib",
        ref: "main",
-       subdir: "instrumentation/opentelemetry_bandit"}
+       subdir: "instrumentation/opentelemetry_bandit"},
+      {:telemetry_metrics_prometheus, "~> 1.1"}
     ]
   end
 

mix.lock

@@ -34,11 +34,14 @@
   "phoenix_pubsub": {:hex, :phoenix_pubsub, "2.1.3", "3168d78ba41835aecad272d5e8cd51aa87a7ac9eb836eabc42f6e57538e3731d", [:mix], [], "hexpm", "bba06bc1dcfd8cb086759f0edc94a8ba2bc8896d5331a1e2c2902bf8e36ee502"},
   "phoenix_template": {:hex, :phoenix_template, "1.0.4", "e2092c132f3b5e5b2d49c96695342eb36d0ed514c5b252a77048d5969330d639", [:mix], [{:phoenix_html, "~> 2.14.2 or ~> 3.0 or ~> 4.0", [hex: :phoenix_html, repo: "hexpm", optional: true]}], "hexpm", "2c0c81f0e5c6753faf5cca2f229c9709919aba34fab866d3bc05060c9c444206"},
   "plug": {:hex, :plug, "1.15.3", "712976f504418f6dff0a3e554c40d705a9bcf89a7ccef92fc6a5ef8f16a30a97", [:mix], [{:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:plug_crypto, "~> 1.1.1 or ~> 1.2 or ~> 2.0", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4.3 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "cc4365a3c010a56af402e0809208873d113e9c38c401cabd88027ef4f5c01fd2"},
+  "plug_cowboy": {:hex, :plug_cowboy, "2.7.1", "87677ffe3b765bc96a89be7960f81703223fe2e21efa42c125fcd0127dd9d6b2", [:mix], [{:cowboy, "~> 2.7", [hex: :cowboy, repo: "hexpm", optional: false]}, {:cowboy_telemetry, "~> 0.3", [hex: :cowboy_telemetry, repo: "hexpm", optional: false]}, {:plug, "~> 1.14", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "02dbd5f9ab571b864ae39418db7811618506256f6d13b4a45037e5fe78dc5de3"},
   "plug_crypto": {:hex, :plug_crypto, "2.0.0", "77515cc10af06645abbfb5e6ad7a3e9714f805ae118fa1a70205f80d2d70fe73", [:mix], [], "hexpm", "53695bae57cc4e54566d993eb01074e4d894b65a3766f1c43e2c61a1b0f45ea9"},
   "ranch": {:hex, :ranch, "1.8.0", "8c7a100a139fd57f17327b6413e4167ac559fbc04ca7448e9be9057311597a1d", [:make, :rebar3], [], "hexpm", "49fbcfd3682fab1f5d109351b61257676da1a2fdbe295904176d5e521a2ddfe5"},
   "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.7", "354c321cf377240c7b8716899e182ce4890c5938111a1296add3ec74cf1715df", [:make, :mix, :rebar3], [], "hexpm", "fe4c190e8f37401d30167c8c405eda19469f34577987c76dde613e838bbc67f8"},
   "telemetry": {:hex, :telemetry, "1.2.1", "68fdfe8d8f05a8428483a97d7aab2f268aaff24b49e0f599faa091f1d4e7f61c", [:rebar3], [], "hexpm", "dad9ce9d8effc621708f99eac538ef1cbe05d6a874dd741de2e689c47feafed5"},
   "telemetry_metrics": {:hex, :telemetry_metrics, "0.6.2", "2caabe9344ec17eafe5403304771c3539f3b6e2f7fb6a6f602558c825d0d0bfb", [:mix], [{:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "9b43db0dc33863930b9ef9d27137e78974756f5f198cae18409970ed6fa5b561"},
+  "telemetry_metrics_prometheus": {:hex, :telemetry_metrics_prometheus, "1.1.0", "1cc23e932c1ef9aa3b91db257ead31ea58d53229d407e059b29bb962c1505a13", [:mix], [{:plug_cowboy, "~> 2.1", [hex: :plug_cowboy, repo: "hexpm", optional: false]}, {:telemetry_metrics_prometheus_core, "~> 1.0", [hex: :telemetry_metrics_prometheus_core, repo: "hexpm", optional: false]}], "hexpm", "d43b3659b3244da44fe0275b717701542365d4519b79d9ce895b9719c1ce4d26"},
+  "telemetry_metrics_prometheus_core": {:hex, :telemetry_metrics_prometheus_core, "1.2.1", "c9755987d7b959b557084e6990990cb96a50d6482c683fb9622a63837f3cd3d8", [:mix], [{:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}, {:telemetry_metrics, "~> 0.6 or ~> 1.0", [hex: :telemetry_metrics, repo: "hexpm", optional: false]}], "hexpm", "5e2c599da4983c4f88a33e9571f1458bf98b0cf6ba930f1dc3a6e8cf45d5afb6"},
   "telemetry_poller": {:hex, :telemetry_poller, "1.0.0", "db91bb424e07f2bb6e73926fcafbfcbcb295f0193e0a00e825e589a0a47e8453", [:rebar3], [{:telemetry, "~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "b3a24eafd66c3f42da30fc3ca7dda1e9d546c12250a2d60d7b81d264fbec4f6e"},
   "thousand_island": {:hex, :thousand_island, "1.3.5", "6022b6338f1635b3d32406ff98d68b843ba73b3aa95cfc27154223244f3a6ca5", [:mix], [{:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "2be6954916fdfe4756af3239fb6b6d75d0b8063b5df03ba76fd8a4c87849e180"},
   "tls_certificate_check": {:hex, :tls_certificate_check, "1.22.1", "0f450cc1568a67a65ce5e15df53c53f9a098c3da081c5f126199a72505858dc1", [:rebar3], [{:ssl_verify_fun, "~> 1.1", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}], "hexpm", "3092be0babdc0e14c2e900542351e066c0fa5a9cf4b3597559ad1e67f07938c0"},