Agent Scripting API 503 during JMeter load test with 50 concurrent agents

General Discussion
1

Running a load test to validate our agent scripting pipeline’s capacity under high concurrency. The goal is to simulate 50 concurrent agents fetching and updating script states via the Genesys Cloud Platform API.

At 50 concurrent threads, getting 503 Service Unavailable responses from the scripting endpoints (POST /api/v2/floccus/agent-scripts). Lower volumes (20 concurrent) work fine, but scaling up causes the failures. The standard voice recording endpoints hold up fine, but the scripting API seems to have a lower threshold.

JMeter config:

  • Thread Group: 50 threads, 5 loop count, 10s ramp-up
  • HTTP Request: POST /api/v2/floccus/agent-scripts
  • Headers: Authorization Bearer, Content-Type application/json
  • Body: { “scriptId”: “abc123”, “status”: “active” }

Any ideas on how to optimize this or if there’s a known limit? Has anyone seen similar 503 errors during high-concurrency scripting operations? Looking for best practices to handle these rate limits or connection drops.

2

This 503 behavior often mirrors the rate-limiting issues seen in other high-concurrency API calls, like the OAuth refresh endpoints. The scripting endpoints (/api/v2/floccus/...) are likely hitting a per-user or per-tenant throttle that isn’t as forgiving as standard media services.

Check the Retry-After header in the 503 response. It usually specifies the exact backoff window. For JMeter, implement a dynamic pause using the __groovy() function to parse this header instead of a static delay. Also, verify if your test accounts have the specific script:edit permissions enabled; sometimes permission checks cascade into timeout errors under load.

If the payload includes large script definitions, consider chunking the updates. The floccus service can struggle with simultaneous large POSTs. Try reducing the payload size or batching smaller updates to see if the 503s disappear. This approach usually stabilizes the connection without needing infrastructure changes.