[Metricbeat] Migrate ETCD Store to use ReporterV2 interface

[sayden]

Refer to #10774 for more info

[sayden]

jenkins, test this again please because No output has been received in the last 10m0s, this potentially indicates a stalled build or something wrong with the build itself.

[sayden]

Error seems unrelated in Elasticsearch module https://beats-ci.elastic.co/job/elastic+beats+pull-request+multijob-linux/beat=metricbeat,label=linux-immutable/5213/console

I think we have a flaky test there

[sayden]

Issue opened describing the flaky test #10866

[jsoriano]

Error seems unrelated in Elasticsearch module https://beats-ci.elastic.co/job/elastic+beats+pull-request+multijob-linux/beat=metricbeat,label=linux-immutable/5213/console

I think we have a flaky test there

This error looks like if the container died, not sure if we should consider this flaky.

[sayden]

Propose the name you want to give it here if you want 😉 #10866

The point is that it shouldn't fail when unrelated code is pushed and it should be fixed somehow, call it flaky test or task.