Environment

• Zabbix server and proxy 8.0.0, proxy with "StartAPMCollector=1"
• OpenTelemetry Collector 0.123.0, OTLP/gRPC receiver and exporter

Steps to reproduce

1. Create proxy "proxy test". On APM tab enable data collection and set Max messages per second to "1".
2. Start Collector with block 1. Its receiver listens on 14317, because proxy uses 4317.
3. Restart proxy. Within 60 seconds send 70 OTLP log requests to Collector, one log each, every 100 ms.
4. Wait 65 seconds and check Collector log.

1. Collector configuration

receivers: 
  otlp: 
    protocols: 
      grpc: 
        endpoint: 127.0.0.1:14317
exporters: 
  otlp: 
    endpoint: 127.0.0.1:4317
    tls: 
      insecure: true
    retry_on_failure: 
      enabled: true
      initial_interval: 1s
      max_interval: 3s
      max_elapsed_time: 120s
    sending_queue: 
      enabled: true
      num_consumers: 1
      queue_size: 1000
service: 
  pipelines: 
    logs: 
      receivers: [otlp]
      exporters: [otlp]
  telemetry: 
    logs: 
      level: info

Result

Exporting failed. Dropping data. {"error": "not retryable error: Permanent error: rpc error: code = ResourceExhausted desc = export rate limit exceeded", "dropped_items": 1}

Expected

Proxy responds with UNAVAILABLE, as documentation says:

If the limit is exceeded, the proxy responds with the gRPC status code UNAVAILABLE (temporary error), so the sender may retry sending the message later, depending on its configuration.