监控Lambda延迟,包括ApiGateway

考虑API网关上的以下CloudWatch警报:

LatencyAlarmP90:
    Type: AWS::CloudWatch::Alarm
    Condition: Production
    Properties:
      AlarmDescription: latency P90 is lower then 1.5 sec
      AlarmName: FooApiP90LatencyAlarm
      ComparisonOperator: GreaterThanOrEqualToThreshold
      ExtendedStatistic: "p90"
      Period: 300
      MetricName: "Latency"
      DatapointsToAlarm: 5
      EvaluationPeriods: 5
      Threshold: 1500
      Namespace: AWS/ApiGateway
      Dimensions:
        - Name: ApiName
          Value: !Sub "bar"
      AlarmActions:
        - Fn::ImportValue: !Sub "foo"
      OKActions:
        - Fn::ImportValue: !Sub foo"

如果触发此警报,我无法知道是哪个特定路由触发了它(多个lambda位于同一API网关上)。

我在考虑监视每个Lambda。

如果我监视特定的Lambda延迟,它是否包括API网关延迟?(冷启动)还是仅运行时间?

如果没有,是否有方法监控特定路由/Lambda,包括API网关延迟?