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MathExpression in Cloudwatch graphs are fixed to a 5min period

See original GitHub issue

When serializing the JSON of MathExpression objects, only the expression is output. If the MathExpression has a period other than 5min (due to being derived, say, from 1m metrics), it gets (incorrectly) rendered with 5min intervals – because the default period at the graph level is 5min, and the serialized MathExpression doesn’t specify one.

Reproduction Steps

from aws_cdk import aws_cloudwatch, aws_elasticloadbalancingv2, core

class Example(core.Construct):
    def __init__(
        scope: core.Construct,
        id: str,
        target_group: aws_elasticloadbalancingv2.ApplicationTargetGroup,
    ) -> None:
        super().__init__(scope, id)

        metric = aws_cloudwatch.MathExpression(
                "something": target_group.metric_healthy_host_count(
                    statistic="average", period=core.Duration.minutes(1),

        dashboard = aws_cloudwatch.Dashboard(self, "dashboard")
        dashboard.add_widgets(aws_cloudwatch.GraphWidget(left=[metric], width=24))

Screen Shot 2020-04-02 at 6 17 59 PM (Note 5-min intervals on the datapoints)

Error Log



  • CLI Version: 1.17.13
  • Framework Version: 1.31.0
  • OS: OS X 10.14.6
  • Language: Python 3.8.0


This is 🐛 Bug Report

Issue Analytics

  • State:closed
  • Created 3 years ago
  • Comments:6 (4 by maintainers)

github_iconTop GitHub Comments

bentonkribbscommented, Mar 11, 2021

Looks like this issue has been fixed:

alexmvcommented, Jun 22, 2020

@rix0rrr: Am I misunderstanding your comment, or was this issue closed in error?

Read more comments on GitHub >

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