Fix Mem0 metadata validation error and improve auto_memory_wrapper example

[ericevans-nv]

Description

Fix a ValidationError in the Mem0 memory editor when the Mem0 API returns null for
the metadata field in search results. The MemoryItem model expects a dict, but
res.pop("metadata", {}) returns None when the key exists with a null value, causing
Pydantic validation to fail.

Additionally:

• Remove the Phoenix tracing exporter from config_zep.yml to eliminate noisy connection
  errors for users without a local Phoenix server
• Add config_mem0.yml as an alternative example config for users who do not have access
  to a Zep API key
• Update the auto_memory_wrapper README to document Mem0 as an alternative memory backend

By Submitting this PR I confirm:

• I am familiar with the Contributing Guidelines.
• We require that all contributors "sign-off" on their commits. This certifies that the contribution is your original work, or you have rights to submit it under the same license, or a compatible license.
  • Any contribution which contains commits that are not Signed-Off will not be accepted.
• When the PR is ready for review, new or existing tests cover these changes.
• When the PR is ready for review, the documentation is up to date with these changes.

Summary by CodeRabbit

• New Features

  • Added support for Mem0 as an alternative memory backend with example configs and setup guidance.

• Bug Fixes

  • Improved robustness of metadata handling in memory operations.

• Documentation

  • Updated examples and docs to include Mem0 options and run commands; removed deprecated Phoenix tracing config and fixed a tutorial reference link.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 2dd77b6 and 66349bd.

📒 Files selected for processing (1)

• docs/source/get-started/tutorials/create-a-new-workflow.md

✅ Files skipped from review due to trivial changes (1)

• docs/source/get-started/tutorials/create-a-new-workflow.md

---

Walkthrough

Adds Mem0 as an alternative memory backend for the auto_memory_wrapper example (docs and new config), removes Phoenix tracing from the Zep config, and makes a defensive null-handling change in Mem0 editor metadata extraction.

Changes

Cohort / File(s)	Summary
Docs / Example README examples/agents/auto_memory_wrapper/README.md	Added Mem0 usage guidance, API key setup block, updated "Running the Example" and Examples sections to include Mem0 alongside Zep.
Example Configs examples/agents/auto_memory_wrapper/configs/config_mem0.yml, examples/agents/auto_memory_wrapper/configs/config_zep.yml	Added config_mem0.yml defining telemetry, nim_llm, mem0_memory backend, tools, ReAct agent, and auto-memory workflow. Removed Phoenix tracing config from config_zep.yml.
Implementation packages/nvidia_nat_mem0ai/src/nat/plugins/mem0ai/mem0_editor.py	Changed metadata extraction from res.pop("metadata", {}) to res.pop("metadata", None) or {} to avoid None-valued metadata causing downstream issues.
Docs / Tutorial Link docs/source/get-started/tutorials/create-a-new-workflow.md	Updated DOCA GPUNetIO reference URL to correct capitalization/path.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly describes the main changes: fixing a Mem0 metadata validation error and adding Mem0 example configuration to improve the auto_memory_wrapper example.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[willkill07]

Thanks for adding a config_mem0.yml example :)

[AnuradhaKaruppiah]

/merge