ApplicationInsights high memory usage

Question

I am hosting a .NET 4.6.1 MVC app in a web app in Azure and collecting telemetry data using Application Insights. Over time memory usage of the app increases to a point where service degrades and a restart is required.

I am currently using version 2.22.0 of ApplicationInsights and the collection of this data is automatic configured by ApplicationInsights.config

I have taken snapshots of the heap memory usage while debugging in visual studio and can see that the memory increase is being caused by:

• String (The hierarchy of this looks like it includes the below 2)
• ConcurrentDictionary+Node<String, Boolean>
• ConcurrentDictionary+Node<String, Boolean>[]

Memory usage 1

Memory usage 2

String memory usage

Concurrent dictionary usage

I'm out my depth here and not sure how to solve this problem?

I've noticed that a change to concurrent dictionary was made here but not sure if this is related?