Multi-instance setups don't flush webhook events properly

[rijkvanzanten]

Describe the Bug

When you modify webhooks, the webhooks are re-registered. However, only the container that ran the original modification of webhooks is aware of this change. This causes the registered webhooks of the secondary instance to be out of sync, causing unexpected behavior when traffic is load balanced between the instances.

To Reproduce

Spin up two instances of Directus connected to the same DB & Redis server. Update webhooks on instance A, observer how the webhook doesn't fire when triggered from instance B.

Errors Shown

n/a

What version of Directus are you using?

49d8975

What version of Node.js are you using?

16.15.0

What database are you using?

Postgres 13.5 w/ Redis 6.2.6

What browser are you using?

n/a

How are you deploying Directus?

Locally