PMM-14908: exclude async replicas from MySQL GR delay panels

[mattiasimonato]

Ticket number: PMM-14908

Feature build: SUBMODULES-5664

• Replication Delay Details panels were showing async replica nodes because worker lag metrics exist for both GR and async
• Intersect those queries with GR member_info (including MySQL 5 variant and $replication_set) so only GR members appear

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.02%. Comparing base (31318c7) to head (effb597).
⚠️ Report is 64 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5664      +/-   ##
==========================================
- Coverage   43.59%   37.02%   -6.57%     
==========================================
  Files         415      215     -200     
  Lines       43134     7160   -35974     
  Branches        0      591     +591     
==========================================
- Hits        18804     2651   -16153     
+ Misses      22454     4371   -18083     
+ Partials     1876      138    -1738     

Flag	Coverage Δ
admin	34.94% <ø> (+0.15%)	⬆️
agent	?
managed	?
unittests	41.29% <ø> (?)
vmproxy	?

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[Copilot]

Pull request overview

This PR updates the MySQL Group Replication Summary Grafana dashboard to ensure the “Replication Delay Details” panels only display Group Replication (GR) members, excluding async replicas that may expose similarly named worker-lag metrics.

Changes:

• Updated five PromQL expressions to intersect worker lag/latency metrics with GR member_info metrics (including the MySQL 5 variant) using and on(service_name).
• Ensures panels only show series for services that are confirmed GR members under the selected $replication_set.

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[michaelcoburn]

👍 thank you!