Temporary commit: requires an updated metrics-lib 2.6.2.

Fixes #30525.

Also update to metrics-lib 2.6.1.

Implements #30218.

See: #30217

Implements #28584.

Previously, we were using longclaw's old IP address (changed in
October 2017) and missing bastet entirely (also added in October
2017).

Fixes #27973.

Fixes #27390.

Part of #27980.