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Fix DynamoDB throttle alarm metric: use Read/WriteThrottleEvents

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ThrottledRequests is not emitted at the TableName-only dimension (only
TableName+Operation), so the table-level alarm would sit permanently in
INSUFFICIENT_DATA and never fire. Replace with ReadThrottleEvents and
WriteThrottleEvents, which AWS/DynamoDB emits at the TableName dimension.
This commit is contained in:
Adam Moussa 2026-06-17 14:21:57 -04:00
parent 38ab8a1487
commit 0a299d5525
1 changed files with 30 additions and 12 deletions
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42
template.yaml
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@ -786,27 +786,45 @@ Resources:
- !Sub "arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts" - !Sub "arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts"
# --- DynamoDB alarms (afterhours-shifts table) --- # --- DynamoDB alarms (afterhours-shifts table) ---
# ThrottledRequests emits at the TableName dimension → safe to alarm. # ReadThrottleEvents / WriteThrottleEvents are the table-level throttle
# NOTE: SystemErrors is INTENTIONALLY OMITTED. AWS emits AWS/DynamoDB # signals: AWS/DynamoDB emits them at the TableName dimension, so these
# SystemErrors only at TableName+Operation granularity, never TableName-only, # alarms transition normally. (ThrottledRequests and SystemErrors are NOT
# so a TableName-only SystemErrors alarm would sit permanently in # emitted at TableName-only granularity — only at TableName+Operation — so
# INSUFFICIENT_DATA. (Verified: no DynamoDB table in this account has ever # alarms on them sit permanently in INSUFFICIENT_DATA and never fire.)
# emitted SystemErrors, consistent with documented per-Operation emission.) ShiftTableReadThrottleAlarm:
ShiftTableThrottleAlarm:
Type: AWS::CloudWatch::Alarm Type: AWS::CloudWatch::Alarm
Properties: Properties:
AlarmName: !Sub "DynamoDB-ThrottledRequests-${ShiftTable}" AlarmName: !Sub "DDB-ReadThrottle-${ShiftTable}"
AlarmDescription: "afterhours-shifts table had one or more throttled requests" AlarmDescription: "afterhours-shifts table had one or more read throttle events"
Namespace: AWS/DynamoDB Namespace: AWS/DynamoDB
MetricName: ThrottledRequests MetricName: ReadThrottleEvents
Dimensions: Dimensions:
- Name: TableName - Name: TableName
Value: !Ref ShiftTable Value: !Ref ShiftTable
Statistic: Sum Statistic: Sum
Period: 300 Period: 300
EvaluationPeriods: 1 EvaluationPeriods: 1
Threshold: 1 Threshold: 0
ComparisonOperator: GreaterThanOrEqualToThreshold ComparisonOperator: GreaterThanThreshold
TreatMissingData: notBreaching
AlarmActions:
- !Sub "arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts"
ShiftTableWriteThrottleAlarm:
Type: AWS::CloudWatch::Alarm
Properties:
AlarmName: !Sub "DDB-WriteThrottle-${ShiftTable}"
AlarmDescription: "afterhours-shifts table had one or more write throttle events"
Namespace: AWS/DynamoDB
MetricName: WriteThrottleEvents
Dimensions:
- Name: TableName
Value: !Ref ShiftTable
Statistic: Sum
Period: 300
EvaluationPeriods: 1
Threshold: 0
ComparisonOperator: GreaterThanThreshold
TreatMissingData: notBreaching TreatMissingData: notBreaching
AlarmActions: AlarmActions:
- !Sub "arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts" - !Sub "arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts"