Documented resuming changefeed from Failed state

[benmeadowcroft]

What is changed, added or deleted? (Required)

From the Failed state the changefeed may be resumed (within the gc-ttl duration). For example, if a downstream issue is encountered for longer than 30 minutes the changefeed transitions to the Failure state. If that downstream issue is resolved within a few hours (less than the default 24 hour gc-ttl) the user may successfully resume the changefeed. This was not documented in the current overview.

Which TiDB version(s) do your changes apply to? (Required)

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• v7.6 (TiDB 7.6 versions)
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[ti-chi-bot]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-12-21 14:02:54.897756555 +0000 UTC m=+1142465.934983481: ☑️ agreed by qiancai.
• 2023-12-22 05:26:56.47072811 +0000 UTC m=+1197907.507955038: ☑️ agreed by ran-huang.

[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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• OWNERS [qiancai]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #15874.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #15875.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch master: #15876.

[qiancai]

According to @nongfushanquan, this PR applies to v6.5.6, v7.1.1, v7.5.0 and later versions.

• v6.5.6: [v6.5.6] Documented resuming changefeed from Failed state (#15555) #15875
• v7.1.1: [v7.1.1]: Documented resuming changefeed from Failed state (#15555) (#15875) #15895
• v7.5: Documented resuming changefeed from Failed state (#15555) #15874
• master: Documented resuming changefeed from Failed state (#15555) #15876

[enkilee]

/assign