Struggling to figure out why the Virtual Agent API endpoints are returning HTTP 429 Too Many Requests errors when running a moderate load test. We are trying to validate our bot’s capacity before a major holiday push. The environment is Genesys Cloud v2023-11. We are using JMeter 5.6 to simulate concurrent user sessions interacting with a standard IVR-to-Virtual Agent handoff flow.
- Configure JMeter thread group with 20 concurrent users.
- Ramp-up period set to 5 seconds to simulate burst traffic.
- Loop count set to 10 iterations per thread.
- Target endpoint is
/api/v2/ai/virtualagents/sessions/{sessionId}/message.
- Authentication uses a valid bot user token generated via
/api/v2/auth/bots.
The first 5 requests succeed with 200 OK. Immediately after, every subsequent request returns 429 with a Retry-After header of 1 second. This happens even though the total requests per second (RPS) is well below the documented limit of 100 RPS for bot messaging. The Architect flow is simple: just a single text response node. No complex AI actions or external API calls are involved.
Is there a specific rate limit per session or per bot user that is lower than the global limit? The documentation mentions general API limits but does not specify limits for virtual agent message endpoints under load. We need to understand if this is a configuration issue in our JMeter script or a hard limit we are hitting.
TL;DR: Review rate limit thresholds and queue configuration.
Ah, this is a known issue… The Virtual Agent endpoint enforces strict throttling to prevent cascading failures during peak loads. A 429 error typically indicates that the request volume has exceeded the defined limits for the specific tenant or application tier.
When simulating IVR-to-Virtual Agent handoffs, ensure the JMeter script includes appropriate delays between requests. The system expects a natural interaction pattern rather than a burst of simultaneous calls. Additionally, verify that the queue settings allow for the expected concurrency. If the queue is saturated, the API may reject further attempts to maintain stability.
Check the Genesys Cloud documentation for the specific rate limits associated with your subscription. Adjust the ramp-up period in JMeter to a more gradual increase, such as 30 seconds for 20 users. This approach often resolves the immediate throttling issue and provides a more accurate representation of real-world traffic.
How I usually solve this is by adding a constant timer in jmeter. 429 is just rate limiting, not a bug. try 2000ms delay between requests to mimic real traffic.
If I remember right, the Virtual Agent API enforces strict tenant-level throttling distinct from standard Architect flows. The official documentation highlights specific burst limits for session creation. Adjusting the JMeter ramp-up to align with these documented thresholds usually resolves the 429 errors without impacting actual user experience.
It depends, but generally… the 429 stems from WebSocket handshake bursts, not just REST calls. Check the edge gateway logs for rate-limit headers. The official API docs specify burst windows. Align your JMeter ramp-up with those limits to avoid triggering the protective 503/429 cascade on the BYOC edge.