Hi Champs,
Today I am sharing a case study for Excessive usages of threads on session expiration processing in Sitecore 9.2 XP and Sitecore 9.2 XC deployments.
Root cause for the issue:
Due to an issue in Session State providers during high load situations, Sitecore instance may end up in a thread starvation issue which can cause the website to become unresponsive.
Solution to the issue:
Sitecore has provided SC Hotfix 367157-1.zip hotfix which is recommended to apply to all Sitecore 9.2 XP and Sitecore 9.2 XC deployments.
The patch should be installed on CD instances (or on servers that are dedicated for handling session expiration, if those are a part of a custom setup).
Happy Learning
Tech Empire 
Is this issue endemi to Azure App Services ?
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It is not.
This issue can be faced only if you have a high load value (but how much high is not suggested by Sitecore).
You need to figure out how much the threshold is for your app service by doing load testing. This hotfix is applicable only in the case of high load website where your Sitecore instance from app service is not capable of handling it.
Below is the KB article for the same.
https://kb.sitecore.net/articles/673673
Hope this helps.
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we had been facing a similar thread starvation on Sitecore 8.2 on ASE’s.
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