91302: Delivery throttled

Twilio records this error when Event Streams temporarily reduces event delivery throughput to a targeted sink. Throttling occurs when the destination endpoint enforces rate limits or returns a high volume of failure responses.

Throttling allows the target sink time to recover or operate within its capacity limits. Twilio automatically retries throttled events; no immediate action is required unless throttling is sustained.

• The sink is repeatedly returning 429 or 5xx responses.
• The sink is experiencing slow response times, causing delivery backpressure.
• A sudden increase in event volume is exceeding the sink endpoint's capacity limits.

• Reduce processing overhead on your sink so it can return a fast 2xx response.
• Confirm that your sink is not configured to rate-limit Twilio's delivery requests.
• If throttling persists during volume spikes, evaluate your event subscription to ensure you are only streaming necessary event types to the sink.
• Increase the capacity or concurrency handling of the sink.

• Event Streams overview
• Sink resource
• Subscription resource