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vcenter-event-broker-appliance
The VMware Event Broker Appliance Fling enables customers to unlock the hidden potential of events in their SDDC to easily create event-driven automation.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Your conclusion is correct, an Alarm can not be trigged once the vSphere Object has been destroyed as the Alarm is mapped to that object. The Event is there and one easy and recommended solution is to leverage the VMware Event Broker Appliance (VEBA) which makes building Event-Driven Automation super easy as you only have to subscribe to Event you want and then have it run the code you desire. Here's an example https://github.com/vmware-samples/vcenter-event-broker-appliance/tree/85494d3d09d66397358b3236778a80db8ad46554/examples/knative/powershell/kn-ps-vsphere-inv-slack that you can refer to and to learn more about VEBA check out https://vmweventbroker.io/