uber / cadence
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LAST BUILD ON BRANCH v1.2.11-prerelease6
branch: v1.2.11-prerelease6
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Persist failover history in DomainInfo data (#6139)

**What changed?**
Added functionality to persist recent failover event data in the DomainInfo whenever a valid failover is executed.
`FailoverEvent` contains the failover `timestamp`, `fromCluster`, `toCluster`, and `FailoverType`("Force"/"Grace") information.
`FailoverHistory` is the key in the `DomainInfo` `data`. It's a slice stored as a string containing the `FailoverEvents`, with max size defined by `dynamicconfig.FrontendFailoverHistoryMaxSize`. It has a default value of 5 and domain filter allowed.
`FailoverHistory` always keep the n most recent `FailoverEvents` and it's sorted by descending timestamp.

**Why?**
Persist failover information, improving failover visibility to clients and the cadence team.

**How did you test it?**
Unit tests and integration tests. Tested locally, triggering failovers in a multiple Cadence clusters with replication environment.

**Potential risks**
The change does not affect the logic of UpdateDomain. It adds the failover info to the DomainInfo data. The main risk is that we introduce something that can cause the code to panic. Errors while adding the FailoverHistory are logged as warnings and do not return/interrupt the UpdateDomain action.

**Release notes**

**Documentation Changes**

27 of 39 new or added lines in 3 files covered. (69.23%)

58 existing lines in 11 files now uncovered.

106648 of 149198 relevant lines covered (71.48%)

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Source Files on v1.2.11-prerelease6

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01903cd8... v1.2.11-prerelease6 Persist failover history in DomainInfo data (#6139) **What changed?** Added functionality to persist recent failover event data in the DomainInfo whenever a valid failover is executed. `FailoverEvent` contains the failover `timestamp`, `fromClu... push web-flow buildkite
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