Metrics exposed:
- sqs_requests_total{tenant, operation} — request counter
- sqs_request_bytes_total{tenant, operation} — traffic counter
- sqs_request_duration_seconds{operation} — latency histogram
- sqs_errors_total{operation} — error counter
- sqs_queues_count{tenant} — gauge, updated every 15s
- sqs_messages_count{tenant} — gauge, updated every 15s