upstream: support ticdc topology info in tidb dashboard

[wlwilliamx]

What problem does this PR solve?

Issue Number: close #1115

What is changed and how it works?

This PR adds support for showing TiCDC cluster node information in the TiDB Dashboard. It works by writing each TiCDC node’s topology info into etcd under the key /topology/ticdc/{clusterID}/{ip:port}. The data includes basic node metadata and is registered with a lease so it gets cleaned up automatically if the node goes down.

The TiDB Dashboard can read from the /topology/ticdc/ prefix, parse the values, and display the list of active TiCDC nodes along with their details. This helps users get a better view of the CDC cluster status directly from the dashboard without needing to query it separately.

Related code in tidb-dashboard repo: https://github.com/pingcap/tidb-dashboard/blob/release-9.0-beta.1/pkg/utils/topology/ticdc.go#L22.

Check List

Tests

• Unit test
• Manual test (add detailed scripts or steps below)

Questions

Will it cause performance regression or break compatibility?

No.

Do you need to update user documentation, design documentation or monitoring documentation?

No.

Release note

None

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[Copilot]

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

pkg/upstream/upstream.go:358

• The use of 'clientV3.WithLease' here may not be compatible with the updated etcd.Client interface. Consider using the corresponding lease option provided by the new etcd client wrapper to ensure consistency.

_, err = up.etcdCli.Put(ctx, key, string(value), clientV3.WithLease(up.session.Lease()))

pkg/upstream/manager.go:31

• The comment refers to 'CaptureTopologyCfg' while the actual type is named 'NodeTopologyCfg'. Consider updating the comment to match the type name for clarity.

// CaptureTopologyCfg stores the information of the capture topology.

[wlwilliamx]

/check-issue-triage-complete

[wk989898]

Does it conflict with the old TiCDC?

[ti-chi-bot]

@wlwilliamx: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cdc-storage-integration-light	67a1ecc	link	true	/test pull-cdc-storage-integration-light

Full PR test history. Your PR dashboard.

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