hm.alert.raised ems error out when alert_id is not matching

Error found in customer logs, [Discord](https://discord.com/channels/855068651522490400/1487208181204521123)
```
time=2026-05-13T15:06:11.421+05:30 level=ERROR source=ems.go:748 msg="failed to get metric" Poller=sar collector=Ems:Ems issuingEms=hm.alert.raised name=events
```