Hello Diptesh Kumar,
Thanks for your question.
To notify that a machine is patched, you will need to leverage Azure Monitor/Azure Automation update management. This is achievable through Update management Centre with the help of azure monitor custom log queries
https://learn.microsoft.com/en-us/azure/update-center/sample-query-logs
https://learn.microsoft.com/en-us/azure/automation/update-management/configure-alerts
For your second question:
In Azure Service Health, a "fired" event indicates that a specific health event has been detected for an Azure service. They can be informational or alert driven
Please let me know if you have further questions**
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