LangChain / LangGraph Agent Instrumentation

[TimPansino]

Overview

• Overhaul LangChain instrumentation to conform to newer standards.
• Add new instrumentation for create_agent in LangChain (which in turn uses LangGraph).
• Overhaul testing structure for LangChain with large matrixing.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	7		0	0	0.93s
✅ MARKDOWN	markdownlint	7	0	0	0	1.35s
✅ PYTHON	ruff	967	0	0	0	1.03s
✅ PYTHON	ruff-format	967	0	0	0	0.36s
✅ YAML	prettier	15	0	0	0	1.41s
✅ YAML	v8r	15		0	0	4.71s
✅ YAML	yamllint	15		0	0	0.68s

See detailed reports in MegaLinter artifacts

[codecov-commenter]

Codecov Report

❌ Patch coverage is 81.40162% with 69 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.67%. Comparing base (002fc85) to head (5b67731).

Files with missing lines	Patch %	Lines
newrelic/hooks/mlmodel_langchain.py	82.94%	31 Missing and 13 partials ⚠️
newrelic/common/llm_utils.py	82.85%	9 Missing and 3 partials ⚠️
newrelic/hooks/mlmodel_langgraph.py	72.72%	4 Missing and 5 partials ⚠️
newrelic/hooks/external_botocore.py	0.00%	2 Missing ⚠️
newrelic/hooks/mlmodel_openai.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1630      +/-   ##
==========================================
- Coverage   81.71%   81.67%   -0.04%     
==========================================
  Files         209      210       +1     
  Lines       24416    24655     +239     
  Branches     3871     3884      +13     
==========================================
+ Hits        19952    20138     +186     
- Misses       3159     3199      +40     
- Partials     1305     1318      +13     

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[TimPansino]

Just reviewed this myself and fixed or tweaked everything I found. Assigning this for full review.

[Newrelic-Boomi]

https://new-relic.atlassian.net/browse/NR-517051