Log to a specific project

Phoenix uses projects to group traces. If left unspecified, all traces are sent to a default project.

Using Phoenix Wrappers
Using OTEL Directly
Via HTTP Header

In the notebook, you can set the PHOENIX_PROJECT_NAME environment variable before adding instrumentation or running any of your code.In python this would look like:

import os

os.environ['PHOENIX_PROJECT_NAME'] = "<your-project-name>"

Note that setting a project via an environment variable only works in a notebook and must be done BEFORE instrumentation is initialized. If you are using OpenInference Instrumentation, see the Server tab for how to set the project name in the Resource attributes.

Alternatively, you can set the project name in your register function call:

from phoenix.otel import register

tracer_provider = register(
    project_name="my-project-name",
    ....
)

If you are using Phoenix as a collector and running your application separately, you can set the project name in the Resource attributes for the trace provider.

from openinference.semconv.resource import ResourceAttributes
from openinference.instrumentation.llama_index import LlamaIndexInstrumentor
from opentelemetry import trace as trace_api
from opentelemetry.exporter.otlp.proto.http.trace_exporter import OTLPSpanExporter
from opentelemetry.sdk import trace as trace_sdk
from opentelemetry.sdk.resources import Resource
from opentelemetry.sdk.trace.export import SimpleSpanProcessor

resource = Resource(attributes={
    ResourceAttributes.PROJECT_NAME: '<your-project-name>'
})
tracer_provider = trace_sdk.TracerProvider(resource=resource)
span_exporter = OTLPSpanExporter(endpoint="http://phoenix:6006/v1/traces")
span_processor = SimpleSpanProcessor(span_exporter=span_exporter)
tracer_provider.add_span_processor(span_processor=span_processor)
trace_api.set_tracer_provider(tracer_provider=tracer_provider)
# Add any auto-instrumentation you want
LlamaIndexInstrumentor().instrument()

If you are using a configuration-based OTEL tool (such as an OTEL Collector, OpenClaw, or any framework that does not let you set resource attributes in code), you can route traces to a specific Phoenix project by setting the x-project-name HTTP header on OTLP HTTP exports.The header takes precedence over the openinference.project.name resource attribute, so every span in the request is assigned to the named project regardless of what the sending library sets in its resource.Using OTEL_EXPORTER_OTLP_HEADERS environment variable:

export OTEL_EXPORTER_OTLP_ENDPOINT="http://localhost:6006"
export OTEL_EXPORTER_OTLP_HEADERS="x-project-name=my-project"

Using an OTEL Collector otlphttp exporter:

exporters:
  otlphttp:
    endpoint: "http://phoenix:6006"
    headers:
      x-project-name: "my-project"

Setting the header in Python directly:

from opentelemetry.exporter.otlp.proto.http.trace_exporter import OTLPSpanExporter

exporter = OTLPSpanExporter(
    endpoint="http://localhost:6006/v1/traces",
    headers={"x-project-name": "my-project"},
)

The x-project-name header is only supported by the HTTP OTLP endpoint (/v1/traces). If you are using gRPC, set the project name via the openinference.project.name resource attribute instead.

Projects work by setting something called the Resource attributes (as seen in the OTEL example above). The phoenix server uses the project name attribute to group traces into the appropriate project. Alternatively, the x-project-name HTTP header can be used to override the project name for all spans in an OTLP HTTP request.

Switching projects in a notebook

Typically you want traces for an LLM app to all be grouped in one project. However, while working with Phoenix inside a notebook, we provide a utility to temporarily associate spans with different projects. You can use this to trace things like evaluations.

Notebook

from openinference.instrumentation import dangerously_using_project

# Switch project to run evals
with dangerously_using_project("my-eval-project"):
    # all spans created within this context will be associated with
    # the "my-eval-project" project.
    # Run evaluations here...

​Log to a specific project

​Switching projects in a notebook

Log to a specific project

Switching projects in a notebook