Lambda
Invocations
→ Total times your function was called.Throttles
→ Number of times Lambda was denied execution due to concurrency limits.ConcurrentExecutions
→ Total currently executing Lambdas across your account.ProvisionedConcurrentExecutions
→ Executions served by provisioned concurrency.UnreservedConcurrentExecutions
→ Executions served from default pool (not reserved).
EBS
VolumeQueueLength
- RAID 0 boosts performance but has zero redundancy
- RAID 10 offers performance and fault tolerance
- If cost doesn’t matter, RAID 10 + io2/io2 Block Express is ideal
- For non-critical, disposable data, RAID 0 is fine
- In RAID 0, one volume fails = total data loss
- Use RAID 0 only if workload tolerates full data loss
References