This pull request includes several changes to the browser_use/agent module, focusing on improving token management, adding step metadata, and enhancing telemetry. Below is a summary of the most important changes:

Token Management Improvements:

• Changed references from total_tokens to current_tokens in browser_use/agent/message_manager/service.py to better reflect the current token count. [1] [2] [3]
• Updated MessageHistory class to use current_tokens instead of total_tokens in browser_use/agent/message_manager/views.py. [1] [2] [3]

Step Metadata Enhancements:

• Added StepMetadata class to store metadata for each step, including timing and token information, in browser_use/agent/views.py.
• Modified AgentHistory and AgentHistoryList classes to include and utilize StepMetadata for better tracking and reporting of step durations and token usage. [1] [2] [3]

Miscellaneous Changes:

• Added import statements for time and StepMetadata in browser_use/agent/service.py. [1] [2]
• Included step start and end times in the step method and passed metadata to _make_history_item in browser_use/agent/service.py. [1] [2] [3] [4] [5]