Collect telemetry data during a serverless function execution

[zmoog]

Decorator, context manager, and thread local

• https://github.com/elastic/apm-agent-python/blob/main/elasticapm/traces.py
• https://github.com/elastic/apm-agent-python/tree/main/elasticapm/context

contextvars https://docs.python.org/3.7/library/contextvars.html (New in version 3.7)

This module provides APIs to manage, store, and access context-local state.

threadlocal vs. contextvars

elasticapm tries to use contextvars and falls back to threadlocal.