Backport of Add more raft metrics, emit more metrics on non-perf standbys into release/1.10.x

[hc-github-team-secure-vault-core]

Backport

This PR is auto-generated from #12166 to be assessed for backporting due to the inclusion of the label backport/1.10.x.

WARNING automatic cherry-pick of commits failed. Commits will require human attention.

merge conflict error: POST https://api.github.com/repos/hashicorp/vault/merges: 409 Merge conflict []

The below text is copied from the body of the original PR.

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• ha_rpc_client_echo and ha_rpc_client_echo_errors aren't raft-specific, but heartbeating is essential to raft autopilot
• raft_storage_stats_applied_index and raft_storage_stats_commit_index show what each node has applied locally
• raft_storage_stats_fsm_pending shows how many logs are pending to be applied to the FSM
• raft_storage_follower_last_heartbeat_ms reports how long it's been since the active node has seen each follower's heartbeat
• raft_storage_follower_applied_index_delta reports delta between active node applied index and each follower's reported applied index (seen in heartbeat)

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Overview of commits

• ce74f4f

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1 Ignored Deployment

Name	Status	Preview	Updated
vault	⬜️ Ignored (Inspect)		Dec 6, 2022 at 7:21PM (UTC)

[schavis]

Closing failed auto-backport PR that is more than 1 month old