Host information is not available when the TiKV instance in the host is down

[breezewish]

trafficstars

Bug Report

Please answer these questions before submitting your issue. Thanks!

What did you do?

Start 1 tikv, 1 tidb, 1 pd on the same node, and then kill the tikv.

What did you expect to see?

The host information can be observed, since the host information can be known by the TiDB or PD.

What did you see instead?

What version of TiDB Dashboard are you using (./tidb-dashboard --version)?

master