vtutrinov opened a new pull request, #7471:
URL: https://github.com/apache/ozone/pull/7471
## What changes were proposed in this pull request?
Reset SCM leadership metric to null only in case the leader is not defined
earlier on initializing the RAFT server
When the SCM servers are in HA mode and start simultaneously leadership
manages to settle down before the HTTP server starts. But the SCM main thread
set the leadership to null with the suggestion the leadership is not defined
yet, and the leadership will not be defined on prometheus metrics level:
```bash
bash-5.1$ for scm in {scm1,scm2,scm3}; do echo ${scm} && curl -s
http://${scm}:9876/prom | grep scmha_metrics_scmha_leader_state ; done
scm1
# TYPE scmha_metrics_scmha_leader_state gauge
scmha_metrics_scmha_leader_state{nodeid="a8b30f45-58b0-4ab2-b52b-9aae232ccc10",hostname="e8121b3ddde2"}
0
scm2
# TYPE scmha_metrics_scmha_leader_state gauge
scmha_metrics_scmha_leader_state{nodeid="ae525b25-2774-4f91-9bbc-83884c1f472d",hostname="a467ff8d65d7"}
0
scm3
# TYPE scmha_metrics_scmha_leader_state gauge
scmha_metrics_scmha_leader_state{nodeid="a5d83fc8-7fe3-4d49-b8f6-159e411bf0fa",hostname="2ea45cb6b00a"}
0
```
The PR suggests resetting the leadership metric to null only in case the
leader is not defined earlier on initializing the RAFT server. Also, the HA
mini-cluster was rewritten to imitate the simultaneous start of the SCM servers
in HA mode
## What is the link to the Apache JIRA
https://issues.apache.org/jira/browse/HDDS-11742
## How was this patch tested?
With existing integration tests after making changes for the Ozone HA
mini-cluster
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