What happens when a trigger fails?

[derrickburns]

The documentation explains that triggers can fail, but does not explain what happens when they do.

To be concrete, here is my question. Say an event is received by a sensor. The sensor sends an HTTP message (webhook). The webhook fails.

What happens to the event? Is it simply dropped? Does the sensor retry? What is the retry policy?

[whynowy]

https://github.com/argoproj/argo-events/blob/master/docs/sensors/more-about-sensors-and-triggers.md#trigger-retries