AWS Lambda

A layer that ships function logs without touching your handler.

The Logstreem extension runs alongside your function, reads the Logs API stream and forwards it. No code change and no CloudWatch dependency.

aws lambda update-function-configuration \
  --function-name checkout-api \
  --layers arn:aws:lambda:us-east-1:451483290750:layer:logstreem-extension:19 \
  --environment "Variables={LOGSTREEM_TOKEN=$LOGSTREEM_TOKEN,LOGSTREEM_DATASET=lambda-prod}"

What the extension adds

Field	Value
`aws.request_id`	The Lambda request id — the join key for a single invocation
`aws.function_name`	Function name
`aws.function_version`	Published version or `$LATEST`
`aws.cold_start`	`true` on the first invocation of a sandbox
`aws.duration_ms`	Billed duration
`aws.memory_used_mb`	Peak memory

Cold starts by function

read top to bottom

1['lambda-prod']
2| where _time > ago(24h)
3| summarize
4    invocations = count(),
5    cold = countif(['aws.cold_start'] == true),
6    p95 = percentile(['aws.duration_ms'], 95)
7  by ['aws.function_name']
8| extend cold_pct = round(100.0 * cold / invocations, 1)
9| order by cold_pct desc

PreviousKubernetes NextCloudflare Workers