Could someone explain the rate limiting thresholds for the /api/v2/conversations/messaging/messages endpoint? We hit 429 errors immediately after 50 concurrent threads in US-East.
Is there a specific header we need to adjust for load testing?
Have you tried implementing exponential backoff in your JMeter script? The RetryPolicy in the genesyscloud_messaging provider handles this automatically, so manual retry logic with retry_count and delay_ms is usually required for raw API tests.
Ah, this is a recognized issue when pushing raw JMeter threads against the Messaging API without respecting the tenant-specific rate limits. The suggestion above regarding exponential backoff is correct for handling the 429s, but it does not address the underlying throughput ceiling. Genesys Cloud enforces strict per-tenant limits on message ingestion, typically capping around 100-200 requests per second depending on your license tier and region configuration. Hitting 50 concurrent threads with a loop count of 100 creates a burst that easily exceeds this threshold, triggering the 429 response before any backoff logic can stabilize the flow.
To get accurate load test results, implement a constant throughput timer in JMeter to cap the requests at 80% of your documented limit. This mimics realistic traffic patterns and prevents the API gateway from throttling your entire test suite.
Warning: Aggressive retry loops without jitter can exacerbate the issue by creating a thundering herd effect, potentially impacting production performance for other tenants sharing the same edge cluster.
Check your request headers for the x-genesys-tenant value and ensure you are using the correct API client credentials scoped for high-volume messaging. From an AppFoundry partner perspective, 429s often stem from hitting the tenant-specific ingestion cap rather than a global API limit, so verifying your license tier’s throughput allowance is critical before scaling further.