I want to see the time taken for a cold start in metrics
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kind/feature
triage/accepted
- Dominant language
- Go
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Description
## In what area(s)?
/area activator
## Describe the feature
situation:
I'd like to see a metric of cold start time, but currently knative doesn't have a metric of cold start time.
suggestion:
We would like to implement the difference between the time the activator received the request and the time it received the response to be included in the `request_latencies` metrics.
Corrections are as follows:
https://github.com/knative/serving/blob/main/pkg/activator/handler/metric_handler.go#L44-L65
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