Hi @vikaschaurasia,
Thanks for reaching out!
I was able to see Metric signal in ADF v2 by going to Azure Portal -> Data factories -> <Your Data factory Name> -> Alerts -> New alert rule -> Select condition -> Select 'Metrics' in Signal type -> Metric signals are shown. For illustration, please check below two screenshots.
Screenshot1:
Screenshot2:
You can also see Metric signal in ADF v2 / ADF by going to Azure Portal -> Monitor -> Alerts -> New alert rule -> Select resource -> Select either 'Data factories' / 'Data factories (v2)' under 'Filter by resource type' section (as per your ADF version) -> Done -> Select condition -> Select 'Metrics' in Signal type -> Metric signals are shown. For illustration, please check below six screenshots.
Screenshot1:
Screenshot2:
Screenshot3:
Screenshot4:
Screenshot5:
In case of Data factories:
Screenshot6:
In case of Data factories (v2):
Let me know if this is not the case with you / if this doesn't help you.