tiproxy: add note about reloading certificates once an hour

[dveeden]

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References:

• https://github.com/pingcap/tiproxy/blob/d9ef65aa16552e7b76ed51d6bf5ce7c0a1504ecd/pkg/manager/cert/manager.go#L96-L121
• https://github.com/pingcap/tiproxy/blob/d9ef65aa16552e7b76ed51d6bf5ce7c0a1504ecd/pkg/manager/cert/manager.go#L21

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[gemini-code-assist]

Summary of Changes

Hello @dveeden, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the TiProxy documentation by providing important information regarding the refresh rate of TLS certificates. It informs users that certificate changes might not take effect immediately due to TiProxy's hourly reloading mechanism, thus improving clarity on expected system behavior when managing security configurations.

Highlights

• Documentation Update: Added a new note to the tiproxy-configuration.md file under the security section.
• Certificate Reloading Behavior: The added note clarifies that TiProxy re-reads certificate files once per hour, meaning changes to certificate files on disk may take up to one hour to be applied.

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[gemini-code-assist]

Code Review

This pull request adds a helpful note to the TiProxy configuration documentation regarding the hourly reloading of certificates. My review focuses on improving the wording of this note for better clarity and adherence to the documentation style guide, suggesting a more direct and user-focused phrasing.

[ti-chi-bot]

@djshow832: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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[qiancai]

Rest LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-12-04 09:57:30.934951024 +0000 UTC m=+516595.748728596: ☑️ agreed by qiancai.
• 2025-12-09 06:49:44.041357363 +0000 UTC m=+937328.855134925: ☑️ agreed by Oreoxmt.

[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #22162.
But this PR has conflicts, please resolve them!