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acme/api-service#247 feat: add payment processing
build ✓test ✓beta ✓libra ●prod
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librabot
deployed to beta. reading logs before promoting to production...
beta environment logs
14:23:01 POST /api/payments 200 142ms
14:23:02 POST /api/payments 200 89ms
14:23:04 POST /api/payments 500 3012ms DynamoDB ProvisionedThroughputExceeded
14:23:05 WARN Lambda memory at 94% (128MB limit)
14:23:06 POST /api/payments 500 3001ms timeout
14:23:08 POST /api/payments 200 201ms
×
production deploy blocked
libra found 2 issues in beta logs. fixing these before promoting to production.
Lambda "payment-handler" hitting memory limit
memory at 94% of 128MB on beta. would OOM in production under real load. increase to 256MB.
DynamoDB throughput exceeded
payments table has 5 WCU provisioned but this endpoint needs ~20. would cause 500s in production.
libra can fix both and re-run the beta check.
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end-to-end request trace
trace id: 1-67f3a2b1-abc123
API Gateway
POST /api/payments
3.2s
500
Lambda
payment-handler
3.1s
timeout
DynamoDB
PutItem payments
2.8s
throttled
SQS
SendMessage receipts
—
not reached
SNS
Publish notification
—
not reached
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bottleneck: DynamoDB PutItem took 2.8s due to throttling. the payments table is provisioned at 5 WCU but this request needed a burst write. this caused the Lambda to timeout at 3s, which returned a 500 to the user. SQS and SNS were never reached.fix: switch payments table to on-demand capacity mode.
ⓘ
suggestion: X-Ray tracing is not enabled on payment-handler. enabling it gives you per-request latency breakdowns automatically.

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libra/fix-s3-public-prod-assets
+ block_public_acls      = true
+ block_public_policy   = true
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libra reviewed this PR and found 2 infra issues

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