Metrics Specs

[achiurizo]

Specs for all the various Metrics we will want to emit.

Feature: Childchain emits Metrics
	The childchain needs to emit metrics to that we can better
	observe what the Childchain is doing and respond to it in a timely manner.
	
Background:
	Given I am the Childchain

Rule: Needs to emit Metrics for Gold Team / Eng

Scenario: Emits Form Block metrics
Scenario: Emits Block Submission metrics
Scenario: Emits PG/Ecto Metrics
Scenario: Emit Event Listener/Callback Processing metrics

@wip
Rule: Needs to emit Metrics for Product / Business

@wip
Rule: Needs to emit Metrics for Infra

[pgebal]

I've read through the code and we emit metrics for event listener:

• number of processed events per event processing service
• number of messages in queue

It's the same as in childchain v1. Do we need more?

We use spandex ecto for tracing calls to db. Are we good with that or do we need more?

Looks like the last 2 are done:

• Scenario: Emits Form Block metrics
• Scenario: Emits Block Submission metrics
• Scenario: Emits PG/Ecto Metrics
• Scenario: Emit Event Listener/Callback Processing metrics

[achiurizo]

@pgebal Awesome! Thanks for looking into this. Let's punt on the reminder of this story for now and focus on getting the network deployed before continuing further with this 🙏