troubleshoot-stale-read.md names a Grafana panel that doesn't exist ("Max Resolved TS gap")

Error Report

1. What is the URL/path of the document related to this issue?

• https://docs.pingcap.com/tidb/dev/troubleshoot-stale-read (troubleshoot-stale-read.md)

2. How would you like to improve it?

The document tells readers to check a panel called Max Resolved TS gap in the TiKV-Details > Resolved-TS Grafana dashboard:

You can first check the Max Resolved TS gap and Min Resolved TS Region metrics in the TiKV-Details > Resolved-TS dashboard:

However, checking the actual dashboard JSON (tikv_details.json in pingcap/monitoring), there is no panel titled "Max Resolved TS gap". The real panel title is "Max gap of resolved-ts" — which matches the name already used correctly elsewhere in the docs, e.g. grafana-tikv-dashboard.md's own panel list:

• Max gap of resolved-ts: The maximum time difference between the resolved-ts of all active Regions in this TiKV and the current time

Could someone confirm and fix the panel name in troubleshoot-stale-read.md (and the image alt text right below it) to say "Max gap of resolved-ts" instead of "Max Resolved TS gap"? A reader following the doc as written would not be able to find the panel by that name in Grafana.

(Found while reviewing the Japanese translation of this page — the JA translation has already been updated to say "Max gap of resolved-ts" to match the real panel, ahead of this EN fix.)

Open troubleshoot-stale-read.md and compare the referenced panel name with the Resolved-TS section in grafana-tikv-dashboard.md or the dashboard JSON mentioned in the issue. Update the panel name and the image alt text, then verify the rendered documentation uses “Max gap of resolved-ts” consistently.