I've got a node app built using a standard node-alpine docker image deployed to Azure App Service. The App Service Plan is set to use 2-core VMs (instance type S2). A single node process will only use a single core at a time. Is Azure scaling the number of containers to fill up available resources? Is it configurable? Or should I be running pm2 inside my container to load balance requests?
No, you will be running one instance of the container. You need to increase the number of app service instances to increase this.