(aws-cloudwatch): Error while creating a cloudwatch alarm with 10 metrics

[andreprawira]

Describe the bug

I'm trying to create a cloudwatch alarm using math expressions that contains more than 10 metrics but i'm seeing an error instead

Expected Behavior

expecting to create more than 10 individual metrics

Current Behavior

RuntimeError: Alarms on math expressions cannot contain more than 10 individual metrics error message

Reproduction Steps

math_expression = cw.MathExpression(
            label="test label",
            expression="IF(e9 OR e10, 1, 0)",
            using_metrics={
                "e9": rds_e9_metric,
                "e7": rds_e7_metric,
                "e2": rds_e2_metric,
                "m2": rds_m2_metric,
                "e3": rds_e3_metric,
                "m1": rds_m1_metric,             
                "e8": rds_e8_metric,
                "e5": rds_e5_metric,      
                "m5": rds_m5_metric,           
                "e10": rds_e10_metric,
                "e1": rds_e1_metric,
                "m3": rds_m3_metric,                
                "e6": rds_e6_metric,
                "m6": rds_m6_metric
            },
            period=cdk.Duration.minutes(5),
        )

this will cause the 10 individual metric error, any idea how to bypass it? seems like an unnecessary limitation

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.51.0 (build a87259f)

Framework Version

No response

Node.js Version

16.18.0

OS

Windows

Language

Python

Language Version

No response

Other information

No response

[khushail]

Hi @andreprawira , thanks for reaching out. Yes, its a limitation from our side as clearly indicated in the docs here.There are no direct solution to bypass this but you could try using multiple math expressions with distributed number of metrics.e.g 2 alarms with 5 metrics each. You could then use an EventBridge rule to trigger an action when either alarm goes into the ALARM state.

[github-actions]

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