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infra: alarm on ALB target 5XX responses #2986

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Merged
cqnykamp merged 1 commit into from
Jul 1, 2026
Merged

infra: alarm on ALB target 5XX responses #2986

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20 changes: 20 additions & 0 deletions infra/cloudformation/service-common.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -782,6 +782,26 @@ Resources:
Type: String
Value: !Ref NagStateMachine

Alb5xxAlarm:
Type: AWS::CloudWatch::Alarm
Condition: LbIsEnabled
Properties:
AlarmName: !Sub "${EnvironmentName}-ALB-Extended-5XX-Errors"
AlarmDescription: ALB is returning 5XX errors
Namespace: AWS/ApplicationELB
MetricName: HTTPCode_Target_5XX_Count
Dimensions:
- Name: LoadBalancer
Value: !GetAtt LoadBalancer.LoadBalancerFullName
Statistic: Sum
Period: 60
EvaluationPeriods: 1
Threshold: 1
ComparisonOperator: GreaterThanOrEqualToThreshold
TreatMissingData: notBreaching
AlarmActions:
- !Ref CloudwatchSNSCriticalTopic

Outputs:
CloudwatchSNSWarningTopic:
Value: !Ref CloudwatchSNSWarningTopic
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