Log Message:
prometheus: updated to 2.22.0

2.22.0

As announced in the 2.21.0 release notes, the experimental gRPC API v2 has been
removed.

[CHANGE] web: Remove APIv2.
[ENHANCEMENT] React UI: Implement missing TSDB head stats section.
[ENHANCEMENT] UI: Add Collapse all button to targets page.
[ENHANCEMENT] UI: Clarify alert state toggle via checkbox icon.
[ENHANCEMENT] Add rule_group_last_evaluation_samples and \ 
prometheus_tsdb_data_replay_duration_seconds metrics.
[ENHANCEMENT] Gracefully handle unknown WAL record types.
[ENHANCEMENT] Issue a warning for 64 bit systems running 32 bit binaries.
[BUGFIX] Adjust scrape timestamps to align them to the intended schedule, \ 
effectively reducing block size. Workaround for a regression in go1.14+.
[BUGFIX] promtool: Ensure alert rules are marked as restored in unit tests.
[BUGFIX] Eureka: Fix service discovery when compiled in 32-bit.
[BUGFIX] Don't do literal regex matching optimisation when case insensitive.
[BUGFIX] Fix classic UI sometimes running queries for instant query when in \ 
range query mode.