Documentation Index
Fetch the complete documentation index at: https://docs.uselemma.ai/llms.txt
Use this file to discover all available pages before exploring further.
Any OpenTelemetry-compatible instrumentation source can export traces to Lemma. Your spans can come from Langfuse, OpenInference, Arize, Braintrust, Azure Application Insights, provider SDK instrumentation, a collector, or custom OpenTelemetry code.
Langfuse is the recommended greenfield instrumentation path. If you already have instrumentation, keep it and add Lemma as an OTLP trace destination.
Required environment variables
LEMMA_BASE_URL (https://api.uselemma.ai/otel/v1/traces)LEMMA_API_KEYLEMMA_PROJECT_ID
LEMMA_BASE_URL is the full Lemma OTLP traces endpoint, not just the API origin. Use https://api.uselemma.ai/otel/v1/traces.
Export to Lemma
Use this when Lemma is the destination for your trace stream.
import { LangfuseSpanProcessor } from "@langfuse/otel";
import { OTLPTraceExporter } from "@opentelemetry/exporter-trace-otlp-proto";
import { NodeTracerProvider } from "@opentelemetry/sdk-trace-node";
const provider = new NodeTracerProvider({
spanProcessors: [
new LangfuseSpanProcessor({
exporter: new OTLPTraceExporter({
url: process.env.LEMMA_BASE_URL,
headers: {
Authorization: `Bearer ${process.env.LEMMA_API_KEY}`,
"X-Lemma-Project-ID": process.env.LEMMA_PROJECT_ID,
},
}),
}),
],
});
provider.register();
import os
from opentelemetry import trace
from opentelemetry.exporter.otlp.proto.http.trace_exporter import OTLPSpanExporter
from opentelemetry.sdk.trace import TracerProvider
from opentelemetry.sdk.trace.export import BatchSpanProcessor
provider = TracerProvider()
provider.add_span_processor(
BatchSpanProcessor(
OTLPSpanExporter(
endpoint=os.environ["LEMMA_BASE_URL"],
headers={
"Authorization": f"Bearer {os.environ['LEMMA_API_KEY']}",
"X-Lemma-Project-ID": os.environ["LEMMA_PROJECT_ID"],
},
)
)
)
trace.set_tracer_provider(provider)
LANGFUSE_* variables are not required for Lemma-only export. Add Langfuse credentials only if you also want traces stored in Langfuse.
Multiple destinations
If the same spans should go to Lemma and another backend, use Dual export.
