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<ol class="toc-list" tabindex="-1">
<li><a href="#" tabindex="0">Description</a></li>
<li><a href="#method-summary" tabindex="0">Method Summary</a></li>
<li><a href="#method-detail" tabindex="0">Method Details</a>
<ol class="toc-list">
<li><a href="#setTracerForTesting(io.opentelemetry.api.trace.Tracer)" tabindex="0">setTracerForTesting(Tracer)</a></li>
<li><a href="#traceToolCall(java.util.Map)" tabindex="0">traceToolCall(Map)</a></li>
<li><a href="#traceToolResponse(com.google.adk.agents.InvocationContext,java.lang.String,com.google.adk.events.Event)" tabindex="0">traceToolResponse(InvocationContext, String, Event)</a></li>
<li><a href="#traceCallLlm(com.google.adk.agents.InvocationContext,java.lang.String,com.google.adk.models.LlmRequest,com.google.adk.models.LlmResponse)" tabindex="0">traceCallLlm(InvocationContext, String, LlmRequest, LlmResponse)</a></li>
<li><a href="#traceSendData(com.google.adk.agents.InvocationContext,java.lang.String,java.util.List)" tabindex="0">traceSendData(InvocationContext, String, List)</a></li>
<li><a href="#getTracer()" tabindex="0">getTracer()</a></li>
<li><a href="#traceFlowable(io.opentelemetry.context.Context,io.opentelemetry.api.trace.Span,java.util.function.Supplier)" tabindex="0">traceFlowable(Context, Span, Supplier)</a></li>
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<!-- ======== START OF CLASS DATA ======== -->
<div class="header">
<h1 title="Class Telemetry" class="title">Class Telemetry</h1>
</div>
<div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a>
<div class="inheritance">com.google.adk.Telemetry</div>
</div>
<section class="class-description" id="class-description">
<hr>
<div class="horizontal-scroll">
<div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">Telemetry</span>
<span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></span></div>
<div class="block">Utility class for capturing and reporting telemetry data within the ADK. This class provides
methods to trace various aspects of the agent's execution, including tool calls, tool responses,
LLM interactions, and data handling. It leverages OpenTelemetry for tracing and logging for
detailed information. These traces can then be exported through the ADK Dev Server UI.</div>
</div>
</section>
<section class="summary">
<ul class="summary-list">
<!-- ========== METHOD SUMMARY =========== -->
<li>
<section class="method-summary" id="method-summary">
<h2>Method Summary</h2>
<div id="method-summary-table">
<div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab1" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab1', 3)" class="table-tab">Static Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div>
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<div class="summary-table three-column-summary">
<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Method</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static io.opentelemetry.api.trace.Tracer</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#getTracer()" class="member-name-link">getTracer</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Gets the tracer.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static void</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#setTracerForTesting(io.opentelemetry.api.trace.Tracer)" class="member-name-link">setTracerForTesting</a><wbr>(io.opentelemetry.api.trace.Tracer&nbsp;tracer)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Sets the OpenTelemetry instance to be used for tracing.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static void</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#traceCallLlm(com.google.adk.agents.InvocationContext,java.lang.String,com.google.adk.models.LlmRequest,com.google.adk.models.LlmResponse)" class="member-name-link">traceCallLlm</a><wbr>(<a href="agents/InvocationContext.html" title="class in com.google.adk.agents">InvocationContext</a>&nbsp;invocationContext,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;eventId,
<a href="models/LlmRequest.html" title="class in com.google.adk.models">LlmRequest</a>&nbsp;llmRequest,
<a href="models/LlmResponse.html" title="class in com.google.adk.models">LlmResponse</a>&nbsp;llmResponse)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Traces a call to the LLM.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static &lt;T&gt;&nbsp;io.reactivex.rxjava3.core.Flowable<wbr>&lt;T&gt;</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#traceFlowable(io.opentelemetry.context.Context,io.opentelemetry.api.trace.Span,java.util.function.Supplier)" class="member-name-link">traceFlowable</a><wbr>(io.opentelemetry.context.Context&nbsp;spanContext,
io.opentelemetry.api.trace.Span&nbsp;span,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/function/Supplier.html" title="class or interface in java.util.function" class="external-link">Supplier</a>&lt;io.reactivex.rxjava3.core.Flowable&lt;T&gt;&gt;&nbsp;flowableSupplier)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Executes a Flowable with an OpenTelemetry Scope active for its entire lifecycle.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static void</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#traceSendData(com.google.adk.agents.InvocationContext,java.lang.String,java.util.List)" class="member-name-link">traceSendData</a><wbr>(<a href="agents/InvocationContext.html" title="class in com.google.adk.agents">InvocationContext</a>&nbsp;invocationContext,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;eventId,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;com.google.genai.types.Content&gt;&nbsp;data)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Traces the sending of data (history or new content) to the agent/model.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static void</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#traceToolCall(java.util.Map)" class="member-name-link">traceToolCall</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>&gt;&nbsp;args)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Traces tool call arguments.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static void</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#traceToolResponse(com.google.adk.agents.InvocationContext,java.lang.String,com.google.adk.events.Event)" class="member-name-link">traceToolResponse</a><wbr>(<a href="agents/InvocationContext.html" title="class in com.google.adk.agents">InvocationContext</a>&nbsp;invocationContext,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;eventId,
<a href="events/Event.html" title="class in com.google.adk.events">Event</a>&nbsp;functionResponseEvent)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Traces tool response event.</div>
</div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class&nbsp;<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#method-summary" title="class or interface in java.lang" class="external-link">Object</a></h3>
<code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div>
</section>
</li>
</ul>
</section>
<section class="details">
<ul class="details-list">
<!-- ============ METHOD DETAIL ========== -->
<li>
<section class="method-details" id="method-detail">
<h2>Method Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="setTracerForTesting(io.opentelemetry.api.trace.Tracer)">
<h3>setTracerForTesting</h3>
<div class="horizontal-scroll">
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">setTracerForTesting</span><wbr><span class="parameters">(io.opentelemetry.api.trace.Tracer&nbsp;tracer)</span></div>
<div class="block">Sets the OpenTelemetry instance to be used for tracing. This is for testing purposes only.</div>
</div>
</section>
</li>
<li>
<section class="detail" id="traceToolCall(java.util.Map)">
<h3>traceToolCall</h3>
<div class="horizontal-scroll">
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">traceToolCall</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>&gt;&nbsp;args)</span></div>
<div class="block">Traces tool call arguments.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>args</code> - The arguments to the tool call.</dd>
</dl>
</div>
</section>
</li>
<li>
<section class="detail" id="traceToolResponse(com.google.adk.agents.InvocationContext,java.lang.String,com.google.adk.events.Event)">
<h3>traceToolResponse</h3>
<div class="horizontal-scroll">
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">traceToolResponse</span><wbr><span class="parameters">(<a href="agents/InvocationContext.html" title="class in com.google.adk.agents">InvocationContext</a>&nbsp;invocationContext,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;eventId,
<a href="events/Event.html" title="class in com.google.adk.events">Event</a>&nbsp;functionResponseEvent)</span></div>
<div class="block">Traces tool response event.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>invocationContext</code> - The invocation context for the current agent run.</dd>
<dd><code>eventId</code> - The ID of the event.</dd>
<dd><code>functionResponseEvent</code> - The function response event.</dd>
</dl>
</div>
</section>
</li>
<li>
<section class="detail" id="traceCallLlm(com.google.adk.agents.InvocationContext,java.lang.String,com.google.adk.models.LlmRequest,com.google.adk.models.LlmResponse)">
<h3>traceCallLlm</h3>
<div class="horizontal-scroll">
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">traceCallLlm</span><wbr><span class="parameters">(<a href="agents/InvocationContext.html" title="class in com.google.adk.agents">InvocationContext</a>&nbsp;invocationContext,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;eventId,
<a href="models/LlmRequest.html" title="class in com.google.adk.models">LlmRequest</a>&nbsp;llmRequest,
<a href="models/LlmResponse.html" title="class in com.google.adk.models">LlmResponse</a>&nbsp;llmResponse)</span></div>
<div class="block">Traces a call to the LLM.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>invocationContext</code> - The invocation context.</dd>
<dd><code>eventId</code> - The ID of the event associated with this LLM call/response.</dd>
<dd><code>llmRequest</code> - The LLM request object.</dd>
<dd><code>llmResponse</code> - The LLM response object.</dd>
</dl>
</div>
</section>
</li>
<li>
<section class="detail" id="traceSendData(com.google.adk.agents.InvocationContext,java.lang.String,java.util.List)">
<h3>traceSendData</h3>
<div class="horizontal-scroll">
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">traceSendData</span><wbr><span class="parameters">(<a href="agents/InvocationContext.html" title="class in com.google.adk.agents">InvocationContext</a>&nbsp;invocationContext,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;eventId,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;com.google.genai.types.Content&gt;&nbsp;data)</span></div>
<div class="block">Traces the sending of data (history or new content) to the agent/model.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>invocationContext</code> - The invocation context.</dd>
<dd><code>eventId</code> - The ID of the event, if applicable.</dd>
<dd><code>data</code> - A list of content objects being sent.</dd>
</dl>
</div>
</section>
</li>
<li>
<section class="detail" id="getTracer()">
<h3>getTracer</h3>
<div class="horizontal-scroll">
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type">io.opentelemetry.api.trace.Tracer</span>&nbsp;<span class="element-name">getTracer</span>()</div>
<div class="block">Gets the tracer.</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>The tracer.</dd>
</dl>
</div>
</section>
</li>
<li>
<section class="detail" id="traceFlowable(io.opentelemetry.context.Context,io.opentelemetry.api.trace.Span,java.util.function.Supplier)">
<h3>traceFlowable</h3>
<div class="horizontal-scroll">
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="type-parameters">&lt;T&gt;</span>
<span class="return-type">io.reactivex.rxjava3.core.Flowable&lt;T&gt;</span>&nbsp;<span class="element-name">traceFlowable</span><wbr><span class="parameters">(io.opentelemetry.context.Context&nbsp;spanContext,
io.opentelemetry.api.trace.Span&nbsp;span,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/function/Supplier.html" title="class or interface in java.util.function" class="external-link">Supplier</a>&lt;io.reactivex.rxjava3.core.Flowable&lt;T&gt;&gt;&nbsp;flowableSupplier)</span></div>
<div class="block">Executes a Flowable with an OpenTelemetry Scope active for its entire lifecycle.
<p>This helper manages the OpenTelemetry Scope lifecycle for RxJava Flowables to ensure proper
context propagation across async boundaries. The scope remains active from when the Flowable is
returned through all operators until stream completion (onComplete, onError, or cancel).
<p><b>Why not try-with-resources?</b> RxJava Flowables execute lazily - operators run at
subscription time, not at chain construction time. Using try-with-resources would close the
scope before the Flowable subscribes, causing Context.current() to return ROOT in nested
operations and breaking parent-child span relationships (fragmenting traces).
<p>The scope is properly closed via doFinally when the stream terminates, ensuring no resource
leaks regardless of completion mode (success, error, or cancellation).</div>
<dl class="notes">
<dt>Type Parameters:</dt>
<dd><span id="traceFlowable(io.opentelemetry.context.Context,io.opentelemetry.api.trace.Span,java.util.function.Supplier)-type-param-T"><code>T</code> - The type of items emitted by the Flowable</span></dd>
<dt>Parameters:</dt>
<dd><code>spanContext</code> - The context containing the span to activate</dd>
<dd><code>span</code> - The span to end when the stream completes</dd>
<dd><code>flowableSupplier</code> - Supplier that creates the Flowable to execute with active scope</dd>
<dt>Returns:</dt>
<dd>Flowable with OpenTelemetry scope lifecycle management</dd>
</dl>
</div>
</section>
</li>
</ul>
</section>
</li>
</ul>
</section>
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