Send OpenTelemetry traces via OTLP to Grafana Cloud directly from Google Cloud Function

main.py

from firebase_functions import https_fn
from firebase_admin import initialize_app
from typing import Any

from opentelemetry import trace
from opentelemetry.exporter.otlp.proto.http.trace_exporter import OTLPSpanExporter
from opentelemetry.sdk.resources import Resource
from opentelemetry.sdk.trace import TracerProvider
from opentelemetry.sdk.trace.export import SimpleSpanProcessor

resource = Resource(attributes={"service.name": "my-service"})
trace.set_tracer_provider(TracerProvider(resource=resource))
tracer = trace.get_tracer(__name__)
otlp_exporter = OTLPSpanExporter(
    # Obtain the cluster location from your Grafana Cloud account page
    # See also: https://grafana.com/docs/grafana-cloud/monitor-infrastructure/otlp/send-data-otlp/
    endpoint="https://otlp-gateway-prod-eu-west-2.grafana.net/otlp/v1/traces",
    # Instead of hardcoding credentials, consider using Cloud Secret Manager
    # Base64-encode your credentials via your console like this:
    #        echo -n "{GRAFANA_INSTANCE_ID}:{CLOUD_API_KEY}" | base64
    headers={"Authorization": "Basic YOUR_BASE64_ENCODED_CREDENTIALS"}
)

span_processor = SimpleSpanProcessor(otlp_exporter)
trace.get_tracer_provider().add_span_processor(span_processor)

initialize_app()

@https_fn.on_call()
def hello(request: https_fn.CallableRequest) -> Any:
    with tracer.start_as_current_span("Say hello"):
        return {"response": "hello!"}

requirements.txt

firebase-functions==0.1.1
opentelemetry-api==1.19.0
opentelemetry-exporter-otlp-proto-http==1.19.0
opentelemetry-sdk==1.19.0
opentelemetry-semantic-conventions==0.40b0