Bug #116231 Router reports: Ignoring unsupported instance <host:port>, type: 'group-member'
Submitted: 25 Sep 15:01 Modified: 25 Sep 15:02
Reporter: Daniel Thorell Email Updates:
Status: Verified Impact on me:
None 
Category:Shell AdminAPI InnoDB Cluster / ReplicaSet Severity:S3 (Non-critical)
Version:8.4.1 OS:Red Hat (8.9)
Assigned to: CPU Architecture:x86

[25 Sep 15:01] Daniel Thorell 
Description:
Starting mysql router 8.4.2 against a replicaset running 8.0.37 causes:
2024-09-25 13:27:51 metadata_cache WARNING [7f527c6eb700] Ignoring unsupported instance db-20:3306, type: 'group-member'
2024-09-25 13:27:51 metadata_cache WARNING [7f527c6eb700] Ignoring unsupported instance db-21:3306, type: 'group-member'
2024-09-25 13:27:51 metadata_cache WARNING [7f527c6eb700] Ignoring unsupported instance db-22:3306, type: 'group-member'

How to repeat:
Install mysql 8.0 series, create replicaset.

Upgrade mysql-shell to 8.4.1, 
Upgrade the replicaset metadata: dba.upgrade_metadata()

Start mysql-router 8.4, logs will have the errors above and do not accept any connections