Track queue time for a Sidekiq worker

[tombruijn]

Track queue time per Sidekiq worker so we can show a graph on our magic Sidekiq dashboard about it. This so you can differentiate between workers in the whole namespace.

• Add metric to SidekiqPlugin:

  appsignal-ruby/lib/appsignal/hooks/sidekiq.rb

  Line 99 in 01cf984

  class SidekiqPlugin # rubocop:disable Metrics/ClassLength

• Update Sidekiq dashboard: https://github.com/appsignal/public_config/blob/d83984e1092fa39d413ee0c8d2eb2d28a3058775/dashboards/sidekiq/main.yml

Per request: https://app.intercom.io/a/apps/yzor8gyw/inbox/inbox/540709/conversations/21372152283

[lucasmazza]

This was once implemented on #112 but looks like #362 remove it 😬

[tombruijn]

Hi @lucasmazza, not sure what you mean. This issue is about tracking it per worker, not overall queue time. Is the overal queue time for Sidekiq broken for you?

[thijssondag]

Yes, would be great to track it per worker!

[tombruijn]

This was once implemented on #112 but looks like #362 remove it 😬

I don't think this worked. I don't know why our custom background job instrumentation docs mention a queue_time option. No component, Ruby gem, extension, agent, or processor read from that option.
I'm going to update it to mention :queue_start, which it does listens to. This option has been removed in Ruby gem version 4. Use Appsignal::Transaction#set_queue_time instead.