# Run defaults: (no OTEL_* variables)
$ python traced.py 'How do I rebuild the search index?'
answer: You can rebuild the search index by running `docs-assistant index --rebuild` (cli.md).

spans:
invocation                                 5659.9 ms
  invoke_agent docs_assistant              5653.6 ms
    call_llm                               1957.8 ms  model=gemini-3.8-flash input_tokens=156 output_tokens=33
      generate_content gemini-3.8-flash    1955.5 ms  model=gemini-3.8-flash input_tokens=156 output_tokens=33
    execute_tool list_pages                   0.9 ms  name=list_pages
    call_llm                               1969.6 ms  model=gemini-3.8-flash input_tokens=218 output_tokens=53
      generate_content gemini-3.8-flash    1967.4 ms  model=gemini-3.8-flash input_tokens=218 output_tokens=53
    execute_tool read_page                    1.1 ms  name=read_page
    call_llm                               1708.1 ms  model=gemini-3.8-flash input_tokens=349 output_tokens=75
      generate_content gemini-3.8-flash    1707.4 ms  model=gemini-3.8-flash input_tokens=349 output_tokens=75

metrics:
gen_ai.execute_tool.duration               docs_assistant,list_pages count=1 sum=0.001 s
gen_ai.execute_tool.duration               docs_assistant,read_page count=1 sum=0.001 s
gen_ai.client.operation.duration           docs_assistant           count=3 sum=5.63 s
gen_ai.client.token.usage                  docs_assistant,input     count=3 sum=723 {token}
gen_ai.client.token.usage                  docs_assistant,output    count=3 sum=161 {token}
gen_ai.invoke_agent.duration               docs_assistant           count=1 sum=5.654 s
gen_ai.invoke_agent.inference_calls        docs_assistant           count=1 sum=3
gen_ai.invoke_agent.tool_calls             docs_assistant           count=1 sum=2

# Run production: OTEL_SERVICE_NAME=docs-assistant ADK_CAPTURE_MESSAGE_CONTENT_IN_SPANS=false
$ python traced.py 'How do I rebuild the search index?'
answer: You can rebuild the search index by running `docs-assistant index --rebuild` (cli.md).

spans:
invocation                                 4576.8 ms
  invoke_agent docs_assistant              4569.2 ms
    call_llm                               1572.3 ms  model=gemini-3.8-flash input_tokens=156 output_tokens=10
      generate_content gemini-3.8-flash    1568.1 ms  model=gemini-3.8-flash input_tokens=156 output_tokens=10
    execute_tool list_pages                   1.1 ms  name=list_pages
    call_llm                               1745.4 ms  model=gemini-3.8-flash input_tokens=195 output_tokens=18
      generate_content gemini-3.8-flash    1744.1 ms  model=gemini-3.8-flash input_tokens=195 output_tokens=18
    execute_tool read_page                    0.3 ms  name=read_page
    call_llm                               1234.8 ms  model=gemini-3.8-flash input_tokens=291 output_tokens=22
      generate_content gemini-3.8-flash    1234.2 ms  model=gemini-3.8-flash input_tokens=291 output_tokens=22

metrics:
gen_ai.execute_tool.duration               docs_assistant,list_pages count=1 sum=0.001 s
gen_ai.execute_tool.duration               docs_assistant,read_page count=1 sum=0.0 s
gen_ai.client.operation.duration           docs_assistant           count=3 sum=4.546 s
gen_ai.client.token.usage                  docs_assistant,input     count=3 sum=642 {token}
gen_ai.client.token.usage                  docs_assistant,output    count=3 sum=50 {token}
gen_ai.invoke_agent.duration               docs_assistant           count=1 sum=4.569 s
gen_ai.invoke_agent.inference_calls        docs_assistant           count=1 sum=3
gen_ai.invoke_agent.tool_calls             docs_assistant           count=1 sum=2

# Run otlp-without-exporter: OTEL_SERVICE_NAME=docs-assistant OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4318
$ python traced.py 'How do I rebuild the search index?'
ModuleNotFoundError: No module named 'opentelemetry.exporter'