What did you do?

1. Start a task without validator.
2. Start validator.

tiup dmctl:v8.5.5 --master-addr=127.0.0.1:8261 validation start --mode full t1

3. Run for a while, verify that "Validator Statistics" in Grafana is populated. (Equivalently, the Prometheus metric dm_validator_validator_binlog_pos is present).

4. Stop and restart validator

tiup dmctl:v8.5.5 --master-addr=127.0.0.1:8261 validation stop t1
tiup dmctl:v8.5.5 --master-addr=127.0.0.1:8261 validation start t1

5. Verify via dmctl query-status that the validator is still running
6. Check Grafana again

What did you expect to see?

Metrics present

What did you see instead?

No metrics

Versions of the cluster

DM version (run dmctl -V or dm-worker -V or dm-master -V):

v8.5.5

Upstream MySQL/MariaDB server version:

v5.7

Downstream TiDB cluster version (execute SELECT tidb_version(); in a MySQL client):

v8.5.5

How did you deploy DM: tiup or manually?

tiup playground

current status of DM cluster (execute query-status <task-name> in dmctl)

No response