cobalt: Add LevelDB errors to Local Storage UMA

[zhongqiliang]

The previous UMA metrics for Local Storage recreate or reset events
did not provide specific error codes. This made it challenging to
diagnose the root causes of database issues.

This change introduces new UMA histograms to capture detailed LevelDB
error statuses when failures occur during Local Storage database open,
read operations, schema version checks, and commit operations. These
specific error codes will provide better insight into the reasons
behind database recreation attempts, improving debuggability and
monitoring.

Bug: 488465561

[github-actions]

🤖 Gemini Suggested Commit Message

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cobalt: Add LevelDB errors to Local Storage UMA

The previous UMA metrics for Local Storage recreate or reset events
did not provide specific error codes. This made it challenging to
diagnose the root causes of database issues.

This change introduces new UMA histograms to capture detailed LevelDB
error statuses when failures occur during Local Storage database open,
read operations, schema version checks, and commit operations. These
specific error codes will provide better insight into the reasons
behind database recreation attempts, improving debuggability and
monitoring.

Bug: 488465561

---

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[gemini-code-assist]

Code Review

This pull request introduces several new UMA histograms to track LevelDB errors during database open, read, commit, and version mismatch operations in Local Storage. Feedback indicates that the DatabaseOpenError histogram is redundant because the status is already recorded elsewhere. Furthermore, the DatabaseVersionMismatch histogram currently logs an 'OK' status in all cases, so it should be replaced with a more descriptive metric type like a boolean or a specific mismatch enum.

[johnxwork]

Did you verify that you can see the data locally with the script in cobalt/tools/ to pull UMA?