Remove instrumentors (#98)

Reviewed-on: https://akkoma.dev/AkkomaGang/akkoma/pulls/98

.woodpecker/.release.yml

@@ -37,8 +37,8 @@ pipeline:
       - *tag-build
       - mix deps.get --only prod
       - mix release --path release
-      - zip akkoma-${tag}.zip -r release
-      - rclone copyto akkoma-${tag}.zip scaleway:akkoma-updates/$BUILD_TAG/akkoma-${tag}.zip
+      - zip akkoma-amd64.zip -r release
+      - rclone copyto akkoma-amd64.zip scaleway:akkoma-updates/$BUILD_TAG/akkoma-amd64.zip
 
   musl:
     image: elixir:1.13-alpine
@@ -55,5 +55,5 @@ pipeline:
       - *tag-build
       - mix deps.get --only prod
       - mix release --path release
-      - zip akkoma-${tag}.zip -r release
-      - rclone copyto akkoma-${tag}.zip scaleway:akkoma-updates/$BUILD_TAG/akkoma-${tag}-musl.zip
+      - zip akkoma-amd64.zip -r release
+      - rclone copyto akkoma-amd64.zip scaleway:akkoma-updates/$BUILD_TAG/akkoma-amd64-musl.zip

CHANGELOG.md

@@ -20,6 +20,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
   - `/api/v1/statuses/{id}/card` 
 - LDAP authenticator
 - Chats, they were half-baked. Just use PMs.
+- Prometheus, it causes massive slowdown
 
 ## 2022.07
 

config/config.exs

@@ -623,13 +623,6 @@
 
 config :pleroma, Pleroma.Emails.NewUsersDigestEmail, enabled: false
 
-config :prometheus, Pleroma.Web.Endpoint.MetricsExporter,
-  enabled: false,
-  auth: false,
-  ip_whitelist: [],
-  path: "/api/pleroma/app_metrics",
-  format: :text
-
 config :pleroma, Pleroma.ScheduledActivity,
   daily_user_limit: 25,
   total_user_limit: 300,

config/description.exs

@@ -3024,43 +3024,6 @@
       }
     ]
   },
-  %{
-    group: :prometheus,
-    key: Pleroma.Web.Endpoint.MetricsExporter,
-    type: :group,
-    description: "Prometheus app metrics endpoint configuration",
-    children: [
-      %{
-        key: :enabled,
-        type: :boolean,
-        description: "[Pleroma extension] Enables app metrics endpoint."
-      },
-      %{
-        key: :ip_whitelist,
-        label: "IP Whitelist",
-        type: [{:list, :string}, {:list, :charlist}, {:list, :tuple}],
-        description: "Restrict access of app metrics endpoint to the specified IP addresses."
-      },
-      %{
-        key: :auth,
-        type: [:boolean, :tuple],
-        description: "Enables HTTP Basic Auth for app metrics endpoint.",
-        suggestion: [false, {:basic, "myusername", "mypassword"}]
-      },
-      %{
-        key: :path,
-        type: :string,
-        description: "App metrics endpoint URI path.",
-        suggestions: ["/api/pleroma/app_metrics"]
-      },
-      %{
-        key: :format,
-        type: :atom,
-        description: "App metrics endpoint output format.",
-        suggestions: [:text, :protobuf]
-      }
-    ]
-  },
   %{
     group: :pleroma,
     key: ConcurrentLimiter,

lib/pleroma/application.ex

@@ -53,7 +53,6 @@ def start(_type, _args) do
     Config.DeprecationWarnings.warn()
     Pleroma.Web.Plugs.HTTPSecurityPlug.warn_if_disabled()
     Pleroma.ApplicationRequirements.verify!()
-    setup_instrumenters()
     load_custom_modules()
     Pleroma.Docs.JSON.compile()
     limiters_setup()
@@ -143,29 +142,6 @@ def load_custom_modules do
     end
   end
 
-  defp setup_instrumenters do
-    require Prometheus.Registry
-
-    if Application.get_env(:prometheus, Pleroma.Repo.Instrumenter) do
-      :ok =
-        :telemetry.attach(
-          "prometheus-ecto",
-          [:pleroma, :repo, :query],
-          &Pleroma.Repo.Instrumenter.handle_event/4,
-          %{}
-        )
-
-      Pleroma.Repo.Instrumenter.setup()
-    end
-
-    Pleroma.Web.Endpoint.MetricsExporter.setup()
-    Pleroma.Web.Endpoint.PipelineInstrumenter.setup()
-
-    # Note: disabled until prometheus-phx is integrated into prometheus-phoenix:
-    # Pleroma.Web.Endpoint.Instrumenter.setup()
-    PrometheusPhx.setup()
-  end
-
   defp cachex_children do
     [
       build_cachex("used_captcha", ttl_interval: seconds_valid_interval()),

lib/pleroma/config/transfer_task.ex

@@ -50,8 +50,7 @@ def load_and_update_env(deleted_settings \\ [], restart_pleroma? \\ true) do
 
       started_applications = Application.started_applications()
 
-      # TODO: some problem with prometheus after restart!
-      reject = [nil, :prometheus, :postgrex]
+      reject = [nil, :postgrex]
 
       reject =
         if restart_pleroma? do

lib/pleroma/repo.ex

@@ -11,8 +11,6 @@ defmodule Pleroma.Repo do
   import Ecto.Query
   require Logger
 
-  defmodule Instrumenter, do: use(Prometheus.EctoInstrumenter)
-
   @doc """
   Dynamically loads the repository url from the
   DATABASE_URL environment variable.

lib/pleroma/web/endpoint.ex

@@ -161,47 +161,6 @@ defmodule Pleroma.Web.Endpoint do
 
   plug(Pleroma.Web.Plugs.RemoteIp)
 
-  defmodule Instrumenter do
-    use Prometheus.PhoenixInstrumenter
-  end
-
-  defmodule PipelineInstrumenter do
-    use Prometheus.PlugPipelineInstrumenter
-  end
-
-  defmodule MetricsExporter do
-    use Prometheus.PlugExporter
-  end
-
-  defmodule MetricsExporterCaller do
-    @behaviour Plug
-
-    def init(opts), do: opts
-
-    def call(conn, opts) do
-      prometheus_config = Application.get_env(:prometheus, MetricsExporter, [])
-      ip_whitelist = List.wrap(prometheus_config[:ip_whitelist])
-
-      cond do
-        !prometheus_config[:enabled] ->
-          conn
-
-        ip_whitelist != [] and
-            !Enum.find(ip_whitelist, fn ip ->
-              Pleroma.Helpers.InetHelper.parse_address(ip) == {:ok, conn.remote_ip}
-            end) ->
-          conn
-
-        true ->
-          MetricsExporter.call(conn, opts)
-      end
-    end
-  end
-
-  plug(PipelineInstrumenter)
-
-  plug(MetricsExporterCaller)
-
   plug(Pleroma.Web.Router)
 
   @doc """

mix.exs

@@ -163,18 +163,6 @@ defp deps do
       {:http_signatures, "~> 0.1.1"},
       {:telemetry, "~> 0.3"},
       {:poolboy, "~> 1.5"},
-      {:prometheus, "~> 4.6"},
-      {:prometheus_ex,
-       git: "https://git.pleroma.social/pleroma/elixir-libraries/prometheus.ex.git",
-       ref: "a4e9beb3c1c479d14b352fd9d6dd7b1f6d7deee5",
-       override: true},
-      {:prometheus_plugs, "~> 1.1"},
-      {:prometheus_phoenix, "~> 1.3"},
-      # Note: once `prometheus_phx` is integrated into `prometheus_phoenix`, remove the former:
-      {:prometheus_phx,
-       git: "https://git.pleroma.social/pleroma/elixir-libraries/prometheus-phx.git",
-       branch: "no-logging"},
-      {:prometheus_ecto, "~> 1.4"},
       {:recon, "~> 2.5"},
       {:quack, "~> 0.1.1"},
       {:joken, "~> 2.0"},

test/pleroma/web/endpoint/metrics_exporter_test.exs

@@ -1,69 +0,0 @@
-# Pleroma: A lightweight social networking server
-# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
-# SPDX-License-Identifier: AGPL-3.0-only
-
-defmodule Pleroma.Web.Endpoint.MetricsExporterTest do
-  # Modifies AppEnv, has to stay synchronous
-  use Pleroma.Web.ConnCase
-
-  alias Pleroma.Web.Endpoint.MetricsExporter
-
-  defp config do
-    Application.get_env(:prometheus, MetricsExporter)
-  end
-
-  describe "with default config" do
-    test "does NOT expose app metrics", %{conn: conn} do
-      conn
-      |> get(config()[:path])
-      |> json_response(404)
-    end
-  end
-
-  describe "when enabled" do
-    setup do
-      initial_config = config()
-      on_exit(fn -> Application.put_env(:prometheus, MetricsExporter, initial_config) end)
-
-      Application.put_env(
-        :prometheus,
-        MetricsExporter,
-        Keyword.put(initial_config, :enabled, true)
-      )
-    end
-
-    test "serves app metrics", %{conn: conn} do
-      conn = get(conn, config()[:path])
-      assert response = response(conn, 200)
-
-      for metric <- [
-            "http_requests_total",
-            "http_request_duration_microseconds",
-            "phoenix_controller_call_duration",
-            "telemetry_scrape_duration",
-            "erlang_vm_memory_atom_bytes_total"
-          ] do
-        assert response =~ ~r/#{metric}/
-      end
-    end
-
-    test "when IP whitelist configured, " <>
-           "serves app metrics only if client IP is whitelisted",
-         %{conn: conn} do
-      Application.put_env(
-        :prometheus,
-        MetricsExporter,
-        Keyword.put(config(), :ip_whitelist, ["127.127.127.127", {1, 1, 1, 1}, '255.255.255.255'])
-      )
-
-      conn
-      |> get(config()[:path])
-      |> json_response(404)
-
-      conn
-      |> Map.put(:remote_ip, {127, 127, 127, 127})
-      |> get(config()[:path])
-      |> response(200)
-    end
-  end
-end