ASM metrics are being sent to DX O2 SAAS via the apmia ASM extension.
The issue is with the ASM monitor if it has name like this:
"https://..."
An example:
ASM monitor name: https://<name of the monitor>
Now, when the apmia ASM extension sends the metrics to DX O2, and you have setup an alert. The alarm (which gets created based on that APM alert) does not have proper values for external ID attribute.
This impacts alarm enrichment where it is not working as the external ID attribute has wrong value.
The fix for this issue has been released in DXO2 SAAS environment.