Is your feature request related to a problem? Please describe.
The message_send_failures in the cluster status info endpoint /cluster currently contains information about the error message latest_error and the error count.
For easier debugging, the time when this error last occurred should be displayed. This allows to see if a specific error is an old, or a current one.

Describe the solution you'd like
Add a last_seen (or last_timestamp or similar) field to https://github.com/qdrant/qdrant/blob/master/lib/storage/src/types.rs#L159 with a human readable timestamp when this error has been last seen.