hydra-notify: initial scratch take of prometheus events

Dependencies

• [2] QEXFA5Y2 hydra-notify: use Hydra::Event
• [3] M2JQG2SN Flake: add perlcritic deps
• [4] 3AKZKWCR RunCommand: Test
• [5] 32KJOERM Turn hydra-notify into a daemon
• [6] P4SME2BC Abstract over postgres' LISTEN/NOTIFY
• [7] 4ZCUCACY hydra-notify: Fix processing notifications
• [8] WYELTQMO Separate payload elements using \t
• [*] RWNXH3H2 lastModified -> lastModifiedDate
• [*] IE2PRAQU hydra-queue-runner: Send build notifications
• [*] FN3QFV6V hydra-notify: Create a helper for running each plugin on an event
• [*] CQZQE32V Improve handling of Perl's block eval errors

Change contents

• edit in flake.nix at line 473
  [10.2514]

  [3.3060]
  + ParallelForkManager
• edit in src/script/hydra-notify at line 6
  [2.18]

  [2.18]
  + use HTTP::Server::PSGI;
• edit in src/script/hydra-notify at line 13
  [4.1752]

  [11.3128]
  + use Parallel::ForkManager;

  + use Prometheus::Tiny::Shared;

  + use Time::HiRes qw( gettimeofday tv_interval );

  +

  + my $prom = Prometheus::Tiny::Shared->new;

  +

  + my $fork_manager = Parallel::ForkManager->new(1 );

  + $fork_manager->start_child("metrics_exporter", sub {

  + my $server = HTTP::Server::PSGI->new(

  + host => "127.0.0.1",

  + port => 9091,

  + timeout => 5,

  + );
• edit in src/script/hydra-notify at line 27
  [11.3129]

  [11.3129]
  + $server->run($prom->psgi);

  + });

  +
• edit in src/script/hydra-notify at line 55
  [12.48]

  [4.1591]
  +

  + my $channelName = $event->{'channel_name'};
• edit in src/script/hydra-notify at line 59
  [12.85]

  [12.85]
  + $prom->inc("notify_plugin_executions", { channel => $channelName, plugin => ref $plugin });
• edit in src/script/hydra-notify at line 61
  [12.100]

  [12.100]
  + my $startTime = [gettimeofday()];
• edit in src/script/hydra-notify at line 63
  [12.143]

  [12.143]
  +

  + $prom->histogram_observe("notify_plugin_runtime", tv_interval($startTime), { channel => $channelName, plugin => ref $plugin });

  + $prom->inc("notify_plugin_success", { channel => $channelName, plugin => ref $plugin });
• edit in src/script/hydra-notify at line 68
  [12.176]

  [12.176]
  + $prom->inc("notify_plugin_error", { channel => $channelName, plugin => ref $plugin });
• edit in src/script/hydra-notify at line 88
  [4.125]

  [4.1923]
  + $prom->inc("event_loop_iterations");
• replacement in src/script/hydra-notify at line 91
  [4.53]→[4.2904:2905](∅→∅),[4.2017]→[4.2904:2905](∅→∅),[4.2904]→[4.2904:2905](∅→∅)
  −
  [4.2017]

  [4.2018]
  + $prom->set("event_received", time());
• edit in src/script/hydra-notify at line 96
  [4.2945]

  [4.220]
  + $prom->inc("notify_event", { channel => $channelName });

  +
• edit in src/script/hydra-notify at line 104
  [13.1235]

  [4.798]
  + $prom->inc("notify_event_error", { channel => $channelName });