push sheeet

pkgs/servers/web-apps/discourse/plugins/discourse-prometheus/Gemfile

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+# gem "rails"
+gem "prometheus_exporter", "2.2.0"

pkgs/servers/web-apps/discourse/plugins/discourse-prometheus/Gemfile.lock

@@ -0,0 +1,15 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    prometheus_exporter (2.2.0)
+      webrick
+    webrick (1.9.1)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  prometheus_exporter (= 2.2.0)
+
+BUNDLED WITH
+   2.5.22

pkgs/servers/web-apps/discourse/plugins/discourse-prometheus/default.nix

@@ -0,0 +1,30 @@
+{
+  lib,
+  mkDiscoursePlugin,
+  fetchFromGitHub,
+}:
+
+mkDiscoursePlugin {
+  bundlerEnvArgs.gemdir = ./.;
+  name = "discourse-prometheus";
+  src = fetchFromGitHub {
+    owner = "discourse";
+    repo = "discourse-prometheus";
+    rev = "f46906e1d555f6838d74ea38d5037264cc1020b0";
+    sha256 = "sha256-czrxhH0L+vCZA8DKN6acW///iWJs9GIppEeaP2MOJBQ=";
+  };
+
+  patches = [
+    # The metrics collector tries to run git to get the commit id but fails
+    # because we don't run Discourse from a Git repository.
+    ./no-git-version.patch
+    ./spec-import-fix-abi-version.patch
+  ];
+
+  meta = with lib; {
+    homepage = "https://github.com/discourse/discourse-prometheus";
+    maintainers = with maintainers; [ dpausp ];
+    license = licenses.mit;
+    description = "Official Discourse Plugin for Prometheus Monitoring";
+  };
+}

pkgs/servers/web-apps/discourse/plugins/discourse-prometheus/gemset.nix

@@ -0,0 +1,23 @@
+{
+  prometheus_exporter = {
+    dependencies = [ "webrick" ];
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "15vl8fw8vjnaj9g129dzrwk9nlrdqgffaj3rys4ba9ns2bqim9rq";
+      type = "gem";
+    };
+    version = "2.2.0";
+  };
+  webrick = {
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "12d9n8hll67j737ym2zw4v23cn4vxyfkb6vyv1rzpwv6y6a3qbdl";
+      type = "gem";
+    };
+    version = "1.9.1";
+  };
+}

pkgs/servers/web-apps/discourse/plugins/discourse-prometheus/no-git-version.patch

@@ -0,0 +1,34 @@
+diff --git a/lib/internal_metric/global.rb b/lib/internal_metric/global.rb
+index 682571b..7bdd431 100644
+--- a/lib/internal_metric/global.rb
++++ b/lib/internal_metric/global.rb
+@@ -30,28 +30,7 @@ module DiscoursePrometheus::InternalMetric
+       @active_app_reqs = 0
+       @queued_app_reqs = 0
+       @fault_logged = {}
+-
+-      begin
+-        @@version = nil
+-
+-        out, error, status = Open3.capture3("git rev-parse HEAD")
+-
+-        if status.success?
+-          @@version ||= out.chomp
+-        else
+-          raise error
+-        end
+-      rescue => e
+-        if defined?(::Discourse)
+-          Discourse.warn_exception(e, message: "Failed to calculate discourse_version_info metric")
+-        else
+-          STDERR.puts "Failed to calculate discourse_version_info metric: #{e}\n#{e.backtrace.join("\n")}"
+-        end
+-
+-        @@retries ||= 10
+-        @@retries -= 1
+-        @@version = -1 if @@retries < 0
+-      end
++      @@version = -1
+     end
+ 
+     def collect

pkgs/servers/web-apps/discourse/plugins/discourse-prometheus/prometheus_exporter_version

@@ -0,0 +1 @@
+2.0.6

pkgs/servers/web-apps/discourse/plugins/discourse-prometheus/spec-import-fix-abi-version.patch

@@ -0,0 +1,16 @@
+diff --git a/bin/collector b/bin/collector
+index 4bdce08178..5edc0a4aee 100755
+--- a/bin/collector
++++ b/bin/collector
+@@ -3,9 +3,11 @@
+
+ Process.setproctitle("discourse prometheus-collector")
+
++# We need the ABI version {MAJOR}.{MINOR}.0 here.
++abi_version = ENV['GEM_PATH'].split("/")[-1]
+ spec_file =
+   File.expand_path(
+-    "../../gems/#{RUBY_VERSION}/specifications/#{"prometheus_exporter-#{ENV["PROMETHEUS_EXPORTER_VERSION"]}"}.gemspec",
++    "../../gems/#{abi_version}/specifications/#{"prometheus_exporter-#{ENV["PROMETHEUS_EXPORTER_VERSION"]}"}.gemspec",
+     __FILE__,
+   )