Include Instance Details in Alerts When a Configured Instance Is Not Found

When an alert is raised for a device where a specific monitored instance is not configured, the resulting alert does not include the instance information, and the alert message does not clearly communicate that the instance is missing. This makes it difficult for users to understand the root cause of the alert without additional investigation. This enhancement would ensure the instance details are included in the alert output and would update the alert message text to explicitly state when a configured instance cannot be found on the device. Providing this context would help customers quickly understand what is missing and reduce the time spent troubleshooting alert conditions.