Intermittent Connection_Abandoned_By_ReqQueue in IIS logs and app pool restarts

Question

Hi there,

We have some of our .net micro services hosted on GCP servers. The server hosts like 8 micro services, each running in its own app pool. We are seeing one of the microservice & its app pool randomly getting restarted. We traced the IIS logs and we see a bunch of Timer_ConnectionIdle followed by Connection_Abandoned_By_ReqQueue just before the app pool restarting.

Example:
2022-12-06 17:33:36 xx.xx.xx.xxxx 65123 xx.xx.xx.xxxx 9120 - - - - - - Timer_ConnectionIdle -
2022-12-06 17:34:17 xx.xx.xx.xxxx 63740 xx.xx.xx.xxxx 9120 HTTP/1.1 POST /v1/app - - 15 Connection_Abandoned_By_ReqQueue app_pool_msv1

The MSV is written using .NET Core 3.1, we don't see any memory spikes on the GCP server. The DMP file we generated doesn't seem to show any major application level errors so far.

Could you assist as to what else we can do to diagonise this issue further?

Thanks!