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Add CloudWatch alarm coverage (meal-order-manager) (#32)
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* Add CloudWatch alarm coverage for the meal-order-manager stack Add CloudWatch alarms (all notifying the shared site-alerts SNS topic, no OKActions, TreatMissingData notBreaching) across the stack: - Lambda Errors + Throttles alarms for all 7 functions (Sum, 5min, threshold 0). - Lambda Duration p99 alarms at ~80% of each function's timeout; API-fronted functions eval 3/3, cron/async functions eval 1/1. Thresholds pending sign-off. - DynamoDB orders-table Read/WriteThrottleEvents alarms (TableName dim). ThrottledRequests/SystemErrors are not published at the table-only dimension, so they are intentionally omitted. - API Gateway (OrderApi v2) 5xx, 4xx (threshold 20, 3/2 to absorb routine authorizer 401s), and p99 Latency alarms. Update README with a Monitoring section and correct the Lambda count to 7 (admin-authorizer was missing). * Drop pending-sign-off wording from alarm docs Duration/Latency thresholds are owner-approved; remove PENDING ADAM SIGN-OFF / pending-sign-off notes from template.yaml comments and README.
This commit is contained in:
Adam Moussa
GitHub
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2 changed files with 554 additions and 1 deletions
22
README.md
22
README.md
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@ -57,10 +57,30 @@ Stack name: `meal-order-manager` (us-east-1)
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- **CloudFront** — HTTPS distribution with custom domain `orders.seahaven.com`
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- **DynamoDB** — `meal-order-manager-orders` (orders, menu, roster, config)
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- **API Gateway** — HttpApi for order submission and admin operations
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- **Lambda** — 6 functions: submit-order, close-form, aggregate-orders, slack-notifier, sync-roster, email-report
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- **Lambda** — 7 functions: submit-order, admin-authorizer, close-form, aggregate-orders, slack-notifier, sync-roster, email-report
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- **EventBridge** — scheduled rules (dual EST/EDT) for close, reminders, payroll email
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- **Secrets Manager** — Slack bot token, form API key
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- **SES** — payroll deduction emails
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- **CloudWatch Alarms** — coverage across the stack, all notifying the shared `site-alerts` SNS topic (see Monitoring)
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## Monitoring
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CloudWatch alarms are defined in `template.yaml`. Every alarm sends to the shared
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`site-alerts` SNS topic (`arn:aws:sns:us-east-1:328440206208:site-alerts`), has no
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OKActions, and treats missing data as not breaching (so idle/cron functions don't
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sit in ALARM between runs). Alarm names follow `meal-order-manager-<fn>-<signal>`.
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- **Lambda Errors / Throttles** — one alarm each per function (7 functions), Sum
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over 5 min, fires on any error/throttle (threshold 0).
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- **Lambda Duration** — p99 over 5 min at ~80% of each function's timeout.
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API-fronted functions (submit-order, admin-authorizer) evaluate 3/3 datapoints;
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cron/async functions evaluate a single datapoint.
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- **DynamoDB orders table** — `ReadThrottleEvents` and `WriteThrottleEvents`
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(TableName dimension). DynamoDB does not publish `ThrottledRequests`/`SystemErrors`
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at the table-only dimension, so those are intentionally not alarmed.
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- **API Gateway (OrderApi, HTTP API v2)** — 5xx (threshold 0), 4xx (threshold 20,
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3/2 datapoints to absorb routine 401s from the token authorizer), and p99 Latency
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(~3000ms).
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## Authentication
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533
template.yaml
533
template.yaml
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@ -598,6 +598,539 @@ Resources:
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LogGroupName: !Sub '/aws/lambda/${SyncRosterFunction}'
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RetentionInDays: 60
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# ─── CloudWatch Alarms ─────────────────────────────────────────
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# All alarms notify the shared site-alerts SNS topic. No OKActions
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# (no recovery spam); TreatMissingData notBreaching so idle / cron
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# functions don't sit in ALARM between invocations.
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#
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# Naming: meal-order-manager-<fn>-<signal> (repo-namespaced kebab-case).
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#
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# Duration alarms use ExtendedStatistic p99 at ~80% of each function's
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# configured timeout. Synchronous (API-fronted) functions evaluate over
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# 3 datapoints; cron / async-invoked functions evaluate a single datapoint
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# (they fire too rarely for a multi-datapoint window).
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# Lambda Errors (Sum, 5min, any error breaches)
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SubmitOrderErrorsAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-submit-order-errors
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AlarmDescription: submit-order Lambda reported one or more errors in 5 minutes.
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Namespace: AWS/Lambda
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MetricName: Errors
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Dimensions:
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- Name: FunctionName
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Value: !Ref SubmitOrderFunction
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Statistic: Sum
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Period: 300
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EvaluationPeriods: 1
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Threshold: 0
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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AdminAuthorizerErrorsAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-admin-authorizer-errors
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AlarmDescription: admin-authorizer Lambda reported one or more errors in 5 minutes.
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Namespace: AWS/Lambda
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MetricName: Errors
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Dimensions:
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- Name: FunctionName
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Value: !Ref AdminAuthorizerFunction
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Statistic: Sum
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Period: 300
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EvaluationPeriods: 1
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Threshold: 0
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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CloseFormErrorsAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-close-form-errors
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AlarmDescription: close-form Lambda reported one or more errors in 5 minutes.
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Namespace: AWS/Lambda
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MetricName: Errors
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Dimensions:
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- Name: FunctionName
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Value: !Ref CloseFormFunction
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Statistic: Sum
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Period: 300
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EvaluationPeriods: 1
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Threshold: 0
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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AggregateOrdersErrorsAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-aggregate-orders-errors
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AlarmDescription: aggregate-orders Lambda reported one or more errors in 5 minutes.
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Namespace: AWS/Lambda
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MetricName: Errors
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Dimensions:
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- Name: FunctionName
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Value: !Ref AggregateOrdersFunction
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Statistic: Sum
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Period: 300
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EvaluationPeriods: 1
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Threshold: 0
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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SlackNotifierErrorsAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-slack-notifier-errors
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AlarmDescription: slack-notifier Lambda reported one or more errors in 5 minutes.
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Namespace: AWS/Lambda
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MetricName: Errors
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Dimensions:
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- Name: FunctionName
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Value: !Ref SlackNotifierFunction
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Statistic: Sum
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Period: 300
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EvaluationPeriods: 1
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Threshold: 0
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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SyncRosterErrorsAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-sync-roster-errors
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AlarmDescription: sync-roster Lambda reported one or more errors in 5 minutes.
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Namespace: AWS/Lambda
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MetricName: Errors
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Dimensions:
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- Name: FunctionName
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Value: !Ref SyncRosterFunction
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Statistic: Sum
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Period: 300
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EvaluationPeriods: 1
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Threshold: 0
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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EmailReportErrorsAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-email-report-errors
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AlarmDescription: email-report Lambda reported one or more errors in 5 minutes.
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Namespace: AWS/Lambda
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MetricName: Errors
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Dimensions:
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- Name: FunctionName
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Value: !Ref EmailReportFunction
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Statistic: Sum
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Period: 300
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EvaluationPeriods: 1
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Threshold: 0
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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# Lambda Throttles (Sum, 5min, any throttle breaches)
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SubmitOrderThrottlesAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-submit-order-throttles
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AlarmDescription: submit-order Lambda was throttled in the last 5 minutes.
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Namespace: AWS/Lambda
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MetricName: Throttles
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Dimensions:
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- Name: FunctionName
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Value: !Ref SubmitOrderFunction
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Statistic: Sum
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Period: 300
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EvaluationPeriods: 1
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Threshold: 0
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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AdminAuthorizerThrottlesAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-admin-authorizer-throttles
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AlarmDescription: admin-authorizer Lambda was throttled in the last 5 minutes.
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Namespace: AWS/Lambda
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MetricName: Throttles
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Dimensions:
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- Name: FunctionName
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Value: !Ref AdminAuthorizerFunction
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Statistic: Sum
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Period: 300
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EvaluationPeriods: 1
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Threshold: 0
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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CloseFormThrottlesAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-close-form-throttles
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AlarmDescription: close-form Lambda was throttled in the last 5 minutes.
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Namespace: AWS/Lambda
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MetricName: Throttles
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Dimensions:
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- Name: FunctionName
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Value: !Ref CloseFormFunction
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Statistic: Sum
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Period: 300
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EvaluationPeriods: 1
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Threshold: 0
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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AggregateOrdersThrottlesAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-aggregate-orders-throttles
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AlarmDescription: aggregate-orders Lambda was throttled in the last 5 minutes.
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Namespace: AWS/Lambda
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MetricName: Throttles
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Dimensions:
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- Name: FunctionName
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Value: !Ref AggregateOrdersFunction
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Statistic: Sum
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Period: 300
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EvaluationPeriods: 1
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Threshold: 0
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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SlackNotifierThrottlesAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-slack-notifier-throttles
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AlarmDescription: slack-notifier Lambda was throttled in the last 5 minutes.
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Namespace: AWS/Lambda
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MetricName: Throttles
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Dimensions:
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- Name: FunctionName
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Value: !Ref SlackNotifierFunction
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Statistic: Sum
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Period: 300
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EvaluationPeriods: 1
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Threshold: 0
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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SyncRosterThrottlesAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-sync-roster-throttles
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AlarmDescription: sync-roster Lambda was throttled in the last 5 minutes.
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Namespace: AWS/Lambda
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MetricName: Throttles
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Dimensions:
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- Name: FunctionName
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Value: !Ref SyncRosterFunction
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Statistic: Sum
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Period: 300
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EvaluationPeriods: 1
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Threshold: 0
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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EmailReportThrottlesAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-email-report-throttles
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AlarmDescription: email-report Lambda was throttled in the last 5 minutes.
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Namespace: AWS/Lambda
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MetricName: Throttles
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Dimensions:
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- Name: FunctionName
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Value: !Ref EmailReportFunction
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Statistic: Sum
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Period: 300
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EvaluationPeriods: 1
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Threshold: 0
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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# Lambda Duration p99 (~80% of timeout)
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# Synchronous (API-fronted) functions: eval 3 / datapoints 3.
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SubmitOrderDurationAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-submit-order-duration
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AlarmDescription: submit-order p99 duration exceeded 8000ms (80% of 10s timeout).
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Namespace: AWS/Lambda
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MetricName: Duration
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Dimensions:
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- Name: FunctionName
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Value: !Ref SubmitOrderFunction
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ExtendedStatistic: p99
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Period: 300
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EvaluationPeriods: 3
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DatapointsToAlarm: 3
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Threshold: 8000
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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AdminAuthorizerDurationAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-admin-authorizer-duration
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AlarmDescription: admin-authorizer p99 duration exceeded 8000ms (80% of 10s timeout).
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Namespace: AWS/Lambda
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MetricName: Duration
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Dimensions:
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- Name: FunctionName
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Value: !Ref AdminAuthorizerFunction
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ExtendedStatistic: p99
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Period: 300
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EvaluationPeriods: 3
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DatapointsToAlarm: 3
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Threshold: 8000
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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# Cron / async-invoked functions: single datapoint (eval 1).
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CloseFormDurationAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-close-form-duration
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AlarmDescription: close-form p99 duration exceeded 24000ms (80% of 30s timeout).
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Namespace: AWS/Lambda
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MetricName: Duration
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Dimensions:
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- Name: FunctionName
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Value: !Ref CloseFormFunction
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ExtendedStatistic: p99
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Period: 300
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EvaluationPeriods: 1
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DatapointsToAlarm: 1
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Threshold: 24000
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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AggregateOrdersDurationAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-aggregate-orders-duration
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AlarmDescription: aggregate-orders p99 duration exceeded 48000ms (80% of 60s timeout).
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Namespace: AWS/Lambda
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MetricName: Duration
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Dimensions:
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- Name: FunctionName
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Value: !Ref AggregateOrdersFunction
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ExtendedStatistic: p99
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Period: 300
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EvaluationPeriods: 1
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DatapointsToAlarm: 1
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Threshold: 48000
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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SlackNotifierDurationAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-slack-notifier-duration
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AlarmDescription: slack-notifier p99 duration exceeded 24000ms (80% of 30s timeout).
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Namespace: AWS/Lambda
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MetricName: Duration
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Dimensions:
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- Name: FunctionName
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Value: !Ref SlackNotifierFunction
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ExtendedStatistic: p99
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Period: 300
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EvaluationPeriods: 1
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DatapointsToAlarm: 1
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Threshold: 24000
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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SyncRosterDurationAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-sync-roster-duration
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AlarmDescription: sync-roster p99 duration exceeded 48000ms (80% of 60s timeout).
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Namespace: AWS/Lambda
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MetricName: Duration
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Dimensions:
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- Name: FunctionName
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Value: !Ref SyncRosterFunction
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ExtendedStatistic: p99
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Period: 300
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EvaluationPeriods: 1
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DatapointsToAlarm: 1
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Threshold: 48000
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ComparisonOperator: GreaterThanThreshold
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TreatMissingData: notBreaching
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AlarmActions:
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- arn:aws:sns:us-east-1:328440206208:site-alerts
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EmailReportDurationAlarm:
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Type: AWS::CloudWatch::Alarm
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Properties:
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AlarmName: meal-order-manager-email-report-duration
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AlarmDescription: email-report p99 duration exceeded 24000ms (80% of 30s timeout).
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Namespace: AWS/Lambda
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MetricName: Duration
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Dimensions:
|
||||
- Name: FunctionName
|
||||
Value: !Ref EmailReportFunction
|
||||
ExtendedStatistic: p99
|
||||
Period: 300
|
||||
EvaluationPeriods: 1
|
||||
DatapointsToAlarm: 1
|
||||
Threshold: 24000
|
||||
ComparisonOperator: GreaterThanThreshold
|
||||
TreatMissingData: notBreaching
|
||||
AlarmActions:
|
||||
- arn:aws:sns:us-east-1:328440206208:site-alerts
|
||||
|
||||
# DynamoDB orders table.
|
||||
# NOTE: DynamoDB does NOT publish ThrottledRequests or SystemErrors at the
|
||||
# TableName-only dimension (verified via cloudwatch list-metrics on
|
||||
# 2026-06-17 — those metrics carry a TableName+Operation dimension pair and
|
||||
# only on-occurrence). A TableName-dim alarm on them would never evaluate.
|
||||
# The codifiable table-level throttle signals are ReadThrottleEvents and
|
||||
# WriteThrottleEvents, which DO carry a TableName-only dimension. Those are
|
||||
# used here for throttle coverage; a TableName-dim SystemErrors alarm is
|
||||
# omitted (no such metric is emitted). See PR body.
|
||||
OrdersTableReadThrottleAlarm:
|
||||
Type: AWS::CloudWatch::Alarm
|
||||
Properties:
|
||||
AlarmName: meal-order-manager-orders-read-throttle
|
||||
AlarmDescription: orders table read requests were throttled in the last 5 minutes.
|
||||
Namespace: AWS/DynamoDB
|
||||
MetricName: ReadThrottleEvents
|
||||
Dimensions:
|
||||
- Name: TableName
|
||||
Value: !Ref OrdersTable
|
||||
Statistic: Sum
|
||||
Period: 300
|
||||
EvaluationPeriods: 1
|
||||
Threshold: 0
|
||||
ComparisonOperator: GreaterThanThreshold
|
||||
TreatMissingData: notBreaching
|
||||
AlarmActions:
|
||||
- arn:aws:sns:us-east-1:328440206208:site-alerts
|
||||
|
||||
OrdersTableWriteThrottleAlarm:
|
||||
Type: AWS::CloudWatch::Alarm
|
||||
Properties:
|
||||
AlarmName: meal-order-manager-orders-write-throttle
|
||||
AlarmDescription: orders table write requests were throttled in the last 5 minutes.
|
||||
Namespace: AWS/DynamoDB
|
||||
MetricName: WriteThrottleEvents
|
||||
Dimensions:
|
||||
- Name: TableName
|
||||
Value: !Ref OrdersTable
|
||||
Statistic: Sum
|
||||
Period: 300
|
||||
EvaluationPeriods: 1
|
||||
Threshold: 0
|
||||
ComparisonOperator: GreaterThanThreshold
|
||||
TreatMissingData: notBreaching
|
||||
AlarmActions:
|
||||
- arn:aws:sns:us-east-1:328440206208:site-alerts
|
||||
|
||||
# API Gateway (HTTP API v2) — OrderApi. Metrics carry the ApiId dimension.
|
||||
OrderApi5xxAlarm:
|
||||
Type: AWS::CloudWatch::Alarm
|
||||
Properties:
|
||||
AlarmName: meal-order-manager-order-api-5xx
|
||||
AlarmDescription: OrderApi returned one or more 5xx responses in 5 minutes.
|
||||
Namespace: AWS/ApiGateway
|
||||
MetricName: 5xx
|
||||
Dimensions:
|
||||
- Name: ApiId
|
||||
Value: !Ref OrderApi
|
||||
Statistic: Sum
|
||||
Period: 300
|
||||
EvaluationPeriods: 1
|
||||
Threshold: 0
|
||||
ComparisonOperator: GreaterThanThreshold
|
||||
TreatMissingData: notBreaching
|
||||
AlarmActions:
|
||||
- arn:aws:sns:us-east-1:328440206208:site-alerts
|
||||
|
||||
# 4xx threshold raised + eval 3 / dp 2 to absorb routine 401s from the
|
||||
# token-based admin authorizer without paging.
|
||||
OrderApi4xxAlarm:
|
||||
Type: AWS::CloudWatch::Alarm
|
||||
Properties:
|
||||
AlarmName: meal-order-manager-order-api-4xx
|
||||
AlarmDescription: OrderApi 4xx responses exceeded 20 in 5 minutes (beyond routine auth noise).
|
||||
Namespace: AWS/ApiGateway
|
||||
MetricName: 4xx
|
||||
Dimensions:
|
||||
- Name: ApiId
|
||||
Value: !Ref OrderApi
|
||||
Statistic: Sum
|
||||
Period: 300
|
||||
EvaluationPeriods: 3
|
||||
DatapointsToAlarm: 2
|
||||
Threshold: 20
|
||||
ComparisonOperator: GreaterThanThreshold
|
||||
TreatMissingData: notBreaching
|
||||
AlarmActions:
|
||||
- arn:aws:sns:us-east-1:328440206208:site-alerts
|
||||
|
||||
# Latency p99 ~3000ms (see PR body).
|
||||
OrderApiLatencyAlarm:
|
||||
Type: AWS::CloudWatch::Alarm
|
||||
Properties:
|
||||
AlarmName: meal-order-manager-order-api-latency
|
||||
AlarmDescription: OrderApi p99 latency exceeded 3000ms.
|
||||
Namespace: AWS/ApiGateway
|
||||
MetricName: Latency
|
||||
Dimensions:
|
||||
- Name: ApiId
|
||||
Value: !Ref OrderApi
|
||||
ExtendedStatistic: p99
|
||||
Period: 300
|
||||
EvaluationPeriods: 3
|
||||
DatapointsToAlarm: 3
|
||||
Threshold: 3000
|
||||
ComparisonOperator: GreaterThanThreshold
|
||||
TreatMissingData: notBreaching
|
||||
AlarmActions:
|
||||
- arn:aws:sns:us-east-1:328440206208:site-alerts
|
||||
|
||||
# ─── SSM Parameters ────────────────────────────────────────────
|
||||
|
||||
SlackChannelParam:
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue