hydra-notify: track the duration of handling an event

Dependencies

• [2] DHOKYWTS Hook up the retryable tasks with hydra-notify
• [3] CQZQE32V Improve handling of Perl's block eval errors
• [4] 4ZCUCACY hydra-notify: Fix processing notifications
• [5] 32KJOERM Turn hydra-notify into a daemon
• [6] I7DFJWL6 hydra-notify: initial scratch take of prometheus events
• [*] IE2PRAQU hydra-queue-runner: Send build notifications
• [*] QEXFA5Y2 hydra-notify: use Hydra::Event
• [*] BJJLHGFC hydra-notify: pre-declare metrics
• [*] P4SME2BC Abstract over postgres' LISTEN/NOTIFY

Change contents

• edit in src/script/hydra-notify at line 7
  [9.18]

  [3.37]
  + use Time::HiRes qw( gettimeofday tv_interval );
• edit in src/script/hydra-notify at line 49
  [10.1339]

  [10.1339]
  + );

  + $prom->declare(

  + "notify_event_runtime",

  + type => "histogram",

  + help => "Number of seconds spent executing events by channel."
• edit in src/script/hydra-notify at line 118
  [11.2017]

  [3.1058]
  + my $start_time = [gettimeofday()];
• replacement in src/script/hydra-notify at line 139
  [3.894]→[3.3440:3450](∅→∅),[3.3440]→[3.3440:3450](∅→∅)
  − }
  [3.894]

  [2.213]
  + };

  +

  + $prom->histogram_observe("notify_event_runtime", tv_interval($start_time), { channel => $channelName });