Have you tried monitoring GitHub Actions? It’s not uncommon for me to find that actions just don’t run for some reason. The docs are so incomplete that it’s hard for me to know why.
I can't say github actions but azure devops yes, I have an http endpoint I want stuff to hit with outcome and if it's not I get bugged. Anything is going to break, for external stuff this is the only way to estimate the cost/benefit of a contingency.