.NET Framework APM agent Memory leak

[baronson (Brad Aronson)]

Kibana version: 7.8.0

Elasticsearch version: 7.8.0

APM Server version: 7.8.0

APM Agent language and versions:

• Elastic.Apm.AspNetFullFramework 1.6.1

• Elastic.Apm.EntityFramework6 1.6.1

Original install method (e.g. download page, yum, deb, from source, etc.) and version: Elastic Cloud

Description of the problem including expected versus actual behavior.: Memory leak occurs when Asp.Net Full Framework and EF 6 agents are running. Memory for this server usually sits between 75% to 85% usage. With agent install the system slowly climbs to 100% memory usage and crashes. This is using the default settings for the agents.

[GregKalapos]

@baronson, I'll look deeper into this, couple of ideas:

• Can you try putting into the application and make sure this executes during app startup?

Activity.DefaultIdFormat = ActivityIdFormat.Hierarchical;
Activity.ForceDefaultIdFormat = true;

This is a related bug which was fixed - if executing that code fixes the issue then it's a leftover edge case and we'll need to do another iteration on it.

• Do you use the Public Agent API or is it just auto instrumentation?
• Any chance giving us a memory dump? And also an agent log on trace level where you let the app run until it collects couple of requests?

The 1. point would be worth trying first - that'd already give me some good hints.

Thanks,
Greg