upgrade Kamon to 2.1.12

[bcarter97]

Description

• Upgrade Kamon to 2.1.12 to remove the nanohttpd peer dependency

Migration notes

• Implicit Config import is no longer needed. Instead, Kamon.init() is called early in the application which bootstraps the metric reporting
• stopAllReports has been renamed -> stopAllModules
• refine has been renamed -> withTags

Other changes

• Prometheus has been added to the docker-compose

[btanyab]

In the application.conf configuration path need to be changed to :

kamon {
  environment.service = "kafka-message-scheduler"
  instrumentation.akka.filters {
    "actors.track" {
      includes = ["kafka-message-scheduler/user/scheduling-actor", "kafka-message-scheduler/user/publisher-actor"]
      excludes = ["kafka-message-scheduler/system/**"]
    }
  }

as per Kamon docs

[peter-hazell]

In the application.conf configuration path need to be changed to :

kamon {
  environment.service = "kafka-message-scheduler"
  instrumentation.akka.filters {
    "actors.track" {
      includes = ["kafka-message-scheduler/user/scheduling-actor", "kafka-message-scheduler/user/publisher-actor"]
      excludes = ["kafka-message-scheduler/system/**"]
    }
  }

as per Kamon docs

Good spot Tanya - final paragraph of the migration guide explains as well: https://kamon.io/docs/latest/guides/migration/from-1.x-to-2.0/#filter-changes

[peter-hazell]

@bcarter97 I think there are couple of parts of the migration guide we should revisit, even though we did see metrics being produced when we tested this, they might not be all the right metrics we expect

https://kamon.io/docs/latest/guides/migration/from-1.x-to-2.0/#there-is-a-new-kamoninit-method - Kamon.init() needs adding in our main method

https://kamon.io/docs/latest/guides/migration/from-1.x-to-2.0/#we-moved-from-aspectj-to-kanela - I think there is an aspectj dependency in build.sbt at the moment, I expect that can be changed to kanela or removed all together.

[btanyab]

Would it be easier to import just kamon-bundle (instead of each module separately) which bundles all the instrumentation modules available in Kamon and the Kanela agent

[paulaylingdev]

Minor comments but looks good!

[paulaylingdev]

Can we update the monitoring paragraph a little in the README.md. I think the link to 'kamon prometheus reporter' is old.

Might be worth adding a sentence that prometheus is included with the docker compose as an example.