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Add information about 2 additional metrics #1705

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Add information about 2 additional metrics with note about openteleme…
mhenc Apr 29, 2026
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Merge branch 'main' into metrics_google_lib
koverholt Apr 30, 2026
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Merge branch 'main' into metrics_google_lib
koverholt May 4, 2026
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4 changes: 4 additions & 0 deletions docs/observability/metrics.md
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Expand Up @@ -28,6 +28,10 @@ When metrics are enabled, ADK automatically instruments the agent's lifecycle, w
| **`gen_ai.agent.request.size`** | Histogram | The size or complexity of the incoming request sent to the agent. | `gen_ai.agent.name` |
| **`gen_ai.agent.response.size`** | Histogram | The size or complexity of the final response generated by the agent. | `gen_ai.agent.name` |
| **`gen_ai.agent.workflow.steps`** | Histogram | Tracks the number of iterative steps or reasoning loops an agent takes to complete a workflow. | `gen_ai.agent.name` |
| **`gen_ai.client.operation.duration`*** | Histogram | The duration of GenAI client operations (e.g., LLM calls). | `gen_ai.agent.name`, `gen_ai.agent.version`, `error.type` |
| **`gen_ai.client.token.usage`*** | Histogram | Token consumption for GenAI client operations. | `gen_ai.agent.name`, `gen_ai.agent.version` |

\* **Note:** ADK natively emits `gen_ai.client.operation.duration` and `gen_ai.client.token.usage`. However, if the `opentelemetry-instrumentation-google-genai` package is installed, ADK suppresses its native emission of these metrics to avoid duplicates. In that case, the metrics will lack the agentic attributes (`gen_ai.agent.name`, `gen_ai.agent.version`).

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