Implement simple Liveness check at `/liveness` returning blank 200 response and rename 'sidekiq_exporter' gitlab.yml entry to 'sidekiq'.
Sidekiq exporter
server can be reused for Kubernetes checks as it is built into Sidekiq process.
And as such it can be used to see if the process is running.
Implementing simple liveness check only requires adding /liveness
endpoint handler that will return 200 response on each request.
Having that in mind sidekiq_exporter
configuration option is is badly named. Lets rename it to something more generic to reflect the fact that it also can be used as Liveness check for Kubernetes. E.g. 'sidekiq'