[NA] Update for modern comet_ml and mlflow

[dsblank]

Summary of Changes

1. Fixed comet_ml Package Compatibility

• Updated imports to work with the current comet_ml package:
  • format_url → merge_url from comet_ml.utils
  • get_comet_api_client → import from comet_ml directly
  • url_join → moved from comet_ml.connection to comet_ml.utils
• Updated format_url() usage to merge_url() with dict parameters

2. Added MLflow Authentication Error Handling

• Added RestException import and handling
• Detects 401 authentication errors when connecting to MLflow stores
• Shows helpful error messages with instructions for Databricks and other authenticated stores

3. Updated Environment Variable

• Changed from MLFLOW_TRACKING_TOKEN to DATABRICKS_TOKEN throughout:
  • Error messages
  • README documentation
  • All references

4. Updated URLs and Branding

• Changed all comet.ml URLs to comet.com:
  • Documentation links
  • Support links
  • Example URLs in README
• Updated user-facing text to reference "Comet ML" or "Comet.com" as appropriate
• Fixed config file path reference from ~/.comet.ini to ~/.comet.config

5. Fixed Databricks Token Generation Instructions

• Removed incorrect reference to #setting/account
• Added step-by-step instructions:
  1. Click user profile icon
  2. Select "User Settings"
  3. Go to "Access Tokens" tab
  4. Click "Generate New Token"

The codebase is now compatible with the current comet_ml package and provides clearer guidance for Databricks authentication.

[Copilot]

Pull request overview

This PR updates the codebase to work with modern versions of comet_ml and mlflow packages, while improving authentication error handling and updating branding from comet.ml to comet.com.

Key Changes:

• Updated comet_ml package imports to use current API structure (e.g., format_url → merge_url, relocated utility imports)
• Added comprehensive MLflow authentication error handling with helpful guidance for Databricks and other authenticated stores
• Changed environment variable from MLFLOW_TRACKING_TOKEN to DATABRICKS_TOKEN and updated all documentation

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
comet_for_mlflow/comet_for_mlflow.py	Updated imports for modern comet_ml API, added authentication error handling with try-catch blocks, changed function calls from format_url() to merge_url(), updated all user-facing text from comet.ml to comet.com
comet_for_mlflow/utils.py	Updated documentation URL from comet.ml to comet.com
tests/test_comet_for_mlflow.py	Updated import path for url_join and changed server address URL from comet.ml to comet.com
examples/keras-example/run.py	Added Databricks-specific configuration for tracking URI and experiment path
README.md	Updated all example URLs from comet.ml to comet.com, added comprehensive authentication section with Databricks token generation instructions

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Lothiraldan]

LGTM