User upgrades VM's in environment to new stemcell. The Apply Changes completes successfully but some of the VM's in the deployment are still showing old stemcell.
This issue can occur if VM's were previously marked as 'bosh ignored' by the platform operators. These ignored instances were not 'unignored' before attempting to apply the new stemcell.
To confirm the issue, run the below command and check if any of the instances in question are marked as 'ignored'.
bosh -d <service-instance-deployment> instances --details
A.) If yes, then:
bosh -d <service-instance-deployment> unignore vm
B.) If no, the user will need to troubleshoot further and/or open a ticket with TANZU Support by Broadcom.
Important Note Regarding mysql VM's:
If TAS core mysql VM's are identified as ignored instances by using the steps on this KB article, then it is recommended to check the health of the cluster before proceeding with the Resolution by running the mysql-diag command from the mysql_monitor VM. ONLY proceed with the Resolution above if all VM's in the cluster are 'healthy' and 'synced' (example picture). If the cluster is not healthy, then will need further troubleshooting first. Open a ticket with TANZU Support by Broadcom for assistance.