feat(bedrock): Multi Agent Support, capturing time metrics from metadata

[satya-turing]

Amazon Bedrock Multi-Agent Support & Time Metrics

Overview

This MR adds two key enhancements to the Amazon Bedrock instrumentation:

1. Multi-Agent Support: Adds support for tracing interactions between multiple collaborating Bedrock agents
2. Time Metrics Capture: Implements extraction of accurate timing information from Bedrock metadata

Details

Multi-Agent Support

• Added capability to trace agent collaborator invocations
• Implemented hierarchical span creation for nested agent calls
• Enhanced trace collection to properly organize multi-agent interaction data

Time Metrics Capture

• Improved span timing accuracy by extracting timestamps from Bedrock metadata
• Added start and end time extraction for all span types
• Enhanced performance metrics for better observability

Impact

These enhancements provide:

• Better visibility into complex multi-agent workflows
• More accurate performance metrics for agent interactions
• Improved debugging capabilities for agent collaborations

Testing

The implementation includes tests for:

• Multi-agent trace collection
• Timing metadata extraction
• Hierarchical span creation with nested agents

[mikeldking]

Hey @satya-turing - we're not fully comprehending all these abstractions and honestly not comfortable at the current moment to have this go into the main bedrock instrumentor since we will have to maintain it. @axiomofjoy and I will come up with a reasonable next step. Possibly a fork. But as it stands it's not a true instrumentation from what I can tell - it's taking signals from bedrock and emitting spans - which will have issues with context propagation.

Will review more in depth tomorrow and come up with a strategy.

[mikeldking]

But this hierarchy should be semantic - what are you considering to be a trace?

[mikeldking]

I think this is somewhat of a dangerous word to use. Trace collector is a known OTEL primitive.