fix(telemetry): remove dependency on old telemetry config (#3830)

# What does this PR do?
old telemetry config was removed in #3815

## Test Plan

❯ OTEL_SERVICE_NAME=aloha
OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4318 uv run llama stack run
starter
<img width="1888" height="605" alt="image"
src="https://github.com/user-attachments/assets/dd5cc9f0-213a-4dc6-9385-f61a3a13b4c3"
/>

llama_stack/core/datatypes.py

@@ -177,6 +177,18 @@ class DistributionSpec(BaseModel):
 
 
 class TelemetryConfig(BaseModel):
+    """
+    Configuration for telemetry.
+
+    Llama Stack uses OpenTelemetry for telemetry. Please refer to https://opentelemetry.io/docs/languages/sdk-configuration/
+    for env variables to configure the OpenTelemetry SDK.
+
+    Example:
+    ```bash
+    OTEL_SERVICE_NAME=llama-stack OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4318 uv run llama stack run starter
+    ```
+    """
+
     enabled: bool = Field(default=False, description="enable or disable telemetry")
 
 

llama_stack/providers/inline/telemetry/meta_reference/telemetry.py

@@ -12,10 +12,8 @@ from opentelemetry.exporter.otlp.proto.http.metric_exporter import OTLPMetricExp
 from opentelemetry.exporter.otlp.proto.http.trace_exporter import OTLPSpanExporter
 from opentelemetry.sdk.metrics import MeterProvider
 from opentelemetry.sdk.metrics.export import PeriodicExportingMetricReader
-from opentelemetry.sdk.resources import Resource
 from opentelemetry.sdk.trace import TracerProvider
 from opentelemetry.sdk.trace.export import BatchSpanProcessor
-from opentelemetry.semconv.resource import ResourceAttributes
 from opentelemetry.trace.propagation.tracecontext import TraceContextTextMapPropagator
 
 from llama_stack.apis.telemetry import (
@@ -30,12 +28,9 @@ from llama_stack.apis.telemetry import (
 )
 from llama_stack.core.datatypes import Api
 from llama_stack.log import get_logger
-from llama_stack.providers.inline.telemetry.meta_reference.console_span_processor import (
-    ConsoleSpanProcessor,
-)
 from llama_stack.providers.utils.telemetry.tracing import ROOT_SPAN_MARKERS
 
-from .config import TelemetryConfig, TelemetrySink
+from .config import TelemetryConfig
 
 _GLOBAL_STORAGE: dict[str, dict[str | int, Any]] = {
     "active_spans": {},
@@ -55,17 +50,10 @@ def is_tracing_enabled(tracer):
 
 
 class TelemetryAdapter(Telemetry):
-    def __init__(self, config: TelemetryConfig, deps: dict[Api, Any]) -> None:
+    def __init__(self, _config: TelemetryConfig, deps: dict[Api, Any]) -> None:
-        self.config = config
         self.datasetio_api = deps.get(Api.datasetio)
         self.meter = None
 
-        resource = Resource.create(
-            {
-                ResourceAttributes.SERVICE_NAME: self.config.service_name,
-            }
-        )
-
         global _TRACER_PROVIDER
         # Initialize the correct span processor based on the provider state.
         # This is needed since once the span processor is set, it cannot be unset.
@@ -73,35 +61,24 @@ class TelemetryAdapter(Telemetry):
         # Since the library client can be recreated multiple times in a notebook,
         # the kernel will hold on to the span processor and cause duplicate spans to be written.
         if _TRACER_PROVIDER is None:
-            provider = TracerProvider(resource=resource)
+            provider = TracerProvider()
             trace.set_tracer_provider(provider)
             _TRACER_PROVIDER = provider
 
             # Use single OTLP endpoint for all telemetry signals
-            if TelemetrySink.OTEL_TRACE in self.config.sinks or TelemetrySink.OTEL_METRIC in self.config.sinks:
-                if self.config.otel_exporter_otlp_endpoint is None:
-                    raise ValueError(
-                        "otel_exporter_otlp_endpoint is required when OTEL_TRACE or OTEL_METRIC is enabled"
-                    )
 
-                # Let OpenTelemetry SDK handle endpoint construction automatically
+            # Let OpenTelemetry SDK handle endpoint construction automatically
-                # The SDK will read OTEL_EXPORTER_OTLP_ENDPOINT and construct appropriate URLs
+            # The SDK will read OTEL_EXPORTER_OTLP_ENDPOINT and construct appropriate URLs
-                # https://opentelemetry.io/docs/languages/sdk-configuration/otlp-exporter
+            # https://opentelemetry.io/docs/languages/sdk-configuration/otlp-exporter
-                if TelemetrySink.OTEL_TRACE in self.config.sinks:
+            span_exporter = OTLPSpanExporter()
-                    span_exporter = OTLPSpanExporter()
+            span_processor = BatchSpanProcessor(span_exporter)
-                    span_processor = BatchSpanProcessor(span_exporter)
+            trace.get_tracer_provider().add_span_processor(span_processor)
-                    trace.get_tracer_provider().add_span_processor(span_processor)
 
-                if TelemetrySink.OTEL_METRIC in self.config.sinks:
+            metric_reader = PeriodicExportingMetricReader(OTLPMetricExporter())
-                    metric_reader = PeriodicExportingMetricReader(OTLPMetricExporter())
+            metric_provider = MeterProvider(metric_readers=[metric_reader])
-                    metric_provider = MeterProvider(resource=resource, metric_readers=[metric_reader])
+            metrics.set_meter_provider(metric_provider)
-                    metrics.set_meter_provider(metric_provider)
 
-            if TelemetrySink.CONSOLE in self.config.sinks:
+        self.meter = metrics.get_meter(__name__)
-                trace.get_tracer_provider().add_span_processor(ConsoleSpanProcessor(print_attributes=True))
-
-        if TelemetrySink.OTEL_METRIC in self.config.sinks:
-            self.meter = metrics.get_meter(__name__)
 
         self._lock = _global_lock