@Xavier Amatriain , Thanks for the follow-up and update.
Apologies you experienced random intermittent issue with the deployment. Your feedback is noted. Glad you were able to do a successful deployment yesterday. Yes, additional logs will be helpful to dig into this further.
Having mentioned, I'm not sure what App Service Plan (ASP) SKU you are leveraging, just to highlight, if the app is hosted in a Free (or Shared) plan, the limits on the resources that the app can use are defined by quotas.
In Free and Shared, the two base tiers, runs an app on the same Azure VM as other App Service apps, including apps of other customers. These tiers allocate CPU quotas to each app that runs on the shared resources, and the resources cannot scale out. These tiers are intended to be used only for development and testing purposes.
You may Monitor apps in Azure App Service
You may review to check the possible reasons for prior deployment issues:
Service health provides a personalized view of the health of the Azure services and regions you're using. This is the best place to look for service impacting communications about outages, planned maintenance activities, and other health advisories because the authenticated Service Health experience knows which services and resources you currently use.
Resource health provides information about the health of your individual cloud resources such as a specific virtual machine instance. Using Azure Monitor, you can also configure alerts to notify you of availability changes to your cloud resources
If you haven't done, when the issue happens, you may try checking the logs in the Azure portal by going to your App Service and selecting "Log stream" under the "Monitoring" section. This will give you real-time access to the logs.
Reference : Azure App Service plan overview
Kindly let us know, I'll follow-up with you further.