opensearch-genai-observability-sdk-py 0.2.7

OpenSearch AI Observability SDK — OTEL-native tracing and scoring for LLM applications

OpenSearch GenAI SDK

OTel-native tracing and scoring for LLM applications. Instrument your AI workflows with standard OpenTelemetry spans and submit evaluation scores — all routed to OpenSearch through a single OTLP pipeline.

Features

• One-line setup — register() configures the full OTel pipeline (TracerProvider, exporter, auto-instrumentation)
• observe() — single decorator / context manager that creates OTel spans with GenAI semantic convention attributes
• enrich() — add model, token usage, and other GenAI attributes to the active span from anywhere in your code
• Auto-instrumentation — automatically discovers and activates installed instrumentor packages (OpenAI, Anthropic, Bedrock, LangChain, etc.)
• Scoring — score() emits evaluation metrics as OTel spans at span, trace, or session level
• AWS SigV4 — built-in SigV4 signing for AWS-hosted OpenSearch and Data Prepper endpoints
• Zero lock-in — remove a decorator and your code still works; everything is standard OTel

Requirements

• Python: 3.10, 3.11, 3.12, or 3.13
• OpenTelemetry SDK: >=1.20.0, <2

Installation

pip install opensearch-genai-observability-sdk-py

The core package includes the OTel SDK and exporters. Auto-instrumentation of LLM libraries is opt-in — install only the providers you use:

# Single provider
pip install opensearch-genai-observability-sdk-py[openai]
pip install opensearch-genai-observability-sdk-py[anthropic]
pip install opensearch-genai-observability-sdk-py[bedrock]
pip install opensearch-genai-observability-sdk-py[langchain]

# Multiple providers
pip install "opensearch-genai-observability-sdk-py[openai,anthropic]"

# All instrumentors at once
pip install opensearch-genai-observability-sdk-py[otel-instrumentors]

# Everything
pip install opensearch-genai-observability-sdk-py[all]

Available extras: openai, anthropic, bedrock, google, langchain, llamaindex, otel-instrumentors (all instrumentors), all

Quick Start

from opensearch_genai_observability_sdk_py import register, observe, Op, enrich, score

# 1. Initialize tracing (one line)
register(endpoint="http://localhost:21890/opentelemetry/v1/traces")

# 2. Trace your functions
@observe(name="web_search", op=Op.EXECUTE_TOOL)
def search(query: str) -> list[dict]:
    return [{"title": f"Result for: {query}"}]

@observe(name="research_agent", op=Op.INVOKE_AGENT)
def research(query: str) -> str:
    results = search(query)
    enrich(model="gpt-4.1", provider="openai", input_tokens=150, output_tokens=50)
    return f"Summary of: {results}"

# 3. Use context managers for inline blocks
@observe(name="qa_pipeline", op=Op.INVOKE_AGENT)
def run(question: str) -> str:
    answer = research(question)
    with observe("safety_check", op="guardrail"):
        enrich(safe=True)
    return answer

result = run("What is OpenSearch?")

# 4. Submit scores (after workflow completes)
score(name="relevance", value=0.95, trace_id="...")

This produces the following span tree:

invoke_agent qa_pipeline
├── invoke_agent research_agent
│   └── execute_tool web_search
└── safety_check

Architecture

┌──────────────────────────────────────────────────────┐
│                   Your Application                    │
│                                                       │
│  @observe(op=Op.INVOKE_AGENT)   enrich()   score()   │
│  with observe("step", op=...)                         │
│                     │                                 │
│         opensearch-genai-observability-sdk-py         │
├──────────────────────────────────────────────────────┤
│  register()                                           │
│  ┌──────────────────────────────────────────────┐    │
│  │  TracerProvider                               │    │
│  │  ├── Resource (service.name)                  │    │
│  │  ├── BatchSpanProcessor                       │    │
│  │  │   └── OTLPSpanExporter (HTTP or gRPC)      │    │
│  │  │       └── SigV4 signing (AWS endpoints)    │    │
│  │  └── Auto-instrumentation                     │    │
│  │      ├── openai, anthropic, bedrock, ...      │    │
│  │      ├── langchain, llamaindex, haystack      │    │
│  │      └── chromadb, pinecone, qdrant, ...      │    │
│  └──────────────────────────────────────────────┘    │
└───────────────────────┬──────────────────────────────┘
                        │ OTLP (HTTP/gRPC)
                        ▼
               ┌─────────────────┐
               │  Data Prepper /  │
               │  OTel Collector  │
               └────────┬────────┘
                        │
                        ▼
               ┌─────────────────┐
               │   OpenSearch     │
               │  ├── traces      │
               │  └── scores      │
               └─────────────────┘

API Reference

register()

Configures the OTel tracing pipeline. Call once at startup.

register(
    endpoint="http://my-collector:4318/v1/traces",  # or use env vars
    service_name="my-app",
    batch=True,            # BatchSpanProcessor (True) or Simple (False)
    auto_instrument=True,  # discover installed instrumentor packages
)

Endpoint resolution (priority order):

1. endpoint= parameter — full URL, used as-is
2. OTEL_EXPORTER_OTLP_TRACES_ENDPOINT env var — full URL, used as-is
3. OTEL_EXPORTER_OTLP_ENDPOINT env var — base URL, /v1/traces appended automatically
4. http://localhost:21890/opentelemetry/v1/traces — Data Prepper default

Protocol resolution (priority order):

1. protocol= parameter — "http" or "grpc"
2. OTEL_EXPORTER_OTLP_TRACES_PROTOCOL env var
3. OTEL_EXPORTER_OTLP_PROTOCOL env var
4. Inferred from URL scheme

URL schemes:

URL scheme	Transport
http:// / https://	HTTP OTLP (protobuf)
grpc://	gRPC (insecure)
grpcs://	gRPC (TLS)

http/json is not supported. A ValueError is raised if the protocol contradicts a grpc:// or grpcs:// URL scheme.

Authenticated endpoints (e.g. AWS OSIS): pass a custom exporter via exporter=:

from opensearch_genai_observability_sdk_py.exporters import AWSSigV4OTLPExporter

register(
    exporter=AWSSigV4OTLPExporter(
        endpoint="https://pipeline.us-east-1.osis.amazonaws.com/v1/traces",
        service="osis",
    )
)

AWSSigV4OTLPExporter is HTTP-only. AWS OSIS does not expose a gRPC endpoint.

observe()

Single tracing primitive — works as both a decorator and a context manager. Creates an OTel span with GenAI semantic convention attributes.

As a decorator:

@observe(name="planner", op=Op.INVOKE_AGENT)
def plan(query: str) -> str:
    enrich(model="gpt-4.1")
    return call_llm(query)

# Without parentheses (uses function name, no op)
@observe
def my_function():
    ...

As a context manager:

with observe("thinking", op=Op.CHAT) as span:
    enrich(model="gpt-4.1", input_tokens=1500)
    result = call_llm(prompt)

Parameters:

Parameter	Type	Default	Description
name	str	Function __qualname__ (decorator) or "unnamed" (context manager)	Span name
op	str	None	gen_ai.operation.name value. Use Op constants or any custom string
kind	SpanKind	INTERNAL	OTel span kind. Use SpanKind.CLIENT for external service calls

Span naming: When op is a well-known value, the span name is "{op} {name}" (e.g. "invoke_agent planner"). Custom ops follow the same pattern.

Attributes set automatically:

Attribute	When set
gen_ai.operation.name	When op is provided
gen_ai.agent.name	All ops except execute_tool
gen_ai.tool.name	When op=Op.EXECUTE_TOOL
gen_ai.input.messages / gen_ai.output.messages	All ops except execute_tool (decorator only)
gen_ai.tool.call.arguments / gen_ai.tool.call.result	When op=Op.EXECUTE_TOOL (decorator only)

Supported function types: sync, async, generators, async generators. Errors are captured as span status + exception events.

Op

Constants for well-known gen_ai.operation.name values. Any custom string is also accepted.

Constant	Value	Use for
Op.CHAT	"chat"	LLM chat completions
Op.INVOKE_AGENT	"invoke_agent"	Agent invocations
Op.CREATE_AGENT	"create_agent"	Agent creation/setup
Op.EXECUTE_TOOL	"execute_tool"	Tool/function calls
Op.RETRIEVAL	"retrieval"	RAG retrieval steps
Op.EMBEDDINGS	"embeddings"	Embedding generation
Op.GENERATE_CONTENT	"generate_content"	Content generation
Op.TEXT_COMPLETION	"text_completion"	Text completions

Custom strings work too: @observe(name="check", op="guardrail").

enrich()

Add GenAI semantic convention attributes to the currently active span. Call from inside an @observe-decorated function or a with observe(...) block.

@observe(name="chat", op=Op.CHAT)
def chat(prompt: str) -> str:
    result = call_llm(prompt)
    enrich(
        model="gpt-4.1",
        provider="openai",
        input_tokens=150,
        output_tokens=50,
        temperature=0.7,
    )
    return result

Parameters:

Parameter	Attribute	Description
model	gen_ai.request.model	Model name
provider	gen_ai.provider.name	Provider name (openai, anthropic, etc.)
input_tokens	gen_ai.usage.input_tokens	Input token count
output_tokens	gen_ai.usage.output_tokens	Output token count
total_tokens	gen_ai.usage.total_tokens	Total token count
response_id	gen_ai.response.id	Response/completion ID
finish_reason	gen_ai.response.finish_reasons	Finish reason(s)
temperature	gen_ai.request.temperature	Temperature setting
max_tokens	gen_ai.request.max_tokens	Max tokens setting
session_id	gen_ai.session.id	Session/conversation ID
**extra	As provided	Any additional key-value attributes

score()

Submits evaluation scores as OTel spans. Use any evaluation framework you prefer (autoevals, RAGAS, custom) and submit the results through score().

The score span is attached to the evaluated trace so it appears in the same trace waterfall as the spans it evaluates.

Two scoring levels:

# Span-level: score a specific span (score becomes a child of that span)
score(
    name="accuracy",
    value=0.95,
    trace_id="6ebb9835f43af1552f2cebb9f5165e39",
    span_id="89829115c2128845",
    explanation="Weather data matches ground truth",
)

# Trace-level: score the entire trace (score attaches to the root span)
score(
    name="relevance",
    value=0.92,
    trace_id="6ebb9835f43af1552f2cebb9f5165e39",
    explanation="Response addresses the user's query",
    attributes={
        "test.suite.name": "nightly_eval",
        "test.case.result.status": "pass",
    },
)

Parameters:

Parameter	Type	Description
name	str	Metric name (e.g., "relevance", "factuality")
value	float	Numeric score
trace_id	str	Hex trace ID of the trace being scored
span_id	str	Hex span ID for span-level scoring. When omitted, attaches to root span
label	str	Human-readable label ("pass", "relevant", "correct")
explanation	str	Evaluator justification (truncated to 500 chars)
response_id	str	LLM completion ID for correlation
attributes	dict	Additional span attributes (keys used as-is, e.g. test.* from semantic-conventions#3398)

Scores follow the OTel GenAI semantic conventions with gen_ai.evaluation.* attributes. Each score span also emits a gen_ai.evaluation.result event per the OTel GenAI event spec.

OpenSearchTraceRetriever

Retrieves GenAI trace spans from OpenSearch. Works with any agent library that emits OTel GenAI semantic convention spans indexed by Data Prepper into otel-v1-apm-span-*.

from opensearch_genai_observability_sdk_py import OpenSearchTraceRetriever

# Option 1: Basic auth (local / docker-compose)
retriever = OpenSearchTraceRetriever(
    host="https://localhost:9200",
    auth=("admin", "admin"),
    verify_certs=False,
)

# Option 2: AWS OpenSearch Service (SigV4) — use this OR Option 1, not both
import boto3
from opensearchpy import RequestsAWSV4SignerAuth

credentials = boto3.Session().get_credentials()
auth = RequestsAWSV4SignerAuth(credentials, "us-west-2", "es")
retriever = OpenSearchTraceRetriever(
    host="https://search-my-domain.us-west-2.es.amazonaws.com",
    auth=auth,
)

# Retrieve all spans for a session or trace
session = retriever.get_traces("my-conversation-id")
for trace in session.traces:
    for span in trace.spans:
        print(f"{span.operation_name}: {span.name} ({span.model})")

# List recent root spans (for discovering traces to evaluate)
roots = retriever.list_root_spans(services=["my-agent"], max_results=10)

# Filter by time
from datetime import datetime
roots = retriever.list_root_spans(services=["my-agent"], since=datetime(2026, 3, 16))

# Check which traces already have evaluation spans
evaluated = retriever.find_evaluated_trace_ids(["trace-id-1", "trace-id-2"])

Constructor:

Parameter	Type	Default	Description
host	str	"https://localhost:9200"	OpenSearch endpoint
index	str	"otel-v1-apm-span-*"	Index pattern for span data
auth	tuple | RequestsAWSV4SignerAuth	None	Basic auth tuple or SigV4 auth
verify_certs	bool	True	Verify TLS certificates

Methods:

Method	Returns	Description
get_traces(identifier, max_spans=10000)	SessionRecord	Fetch spans by conversation ID or trace ID
list_root_spans(services=None, since=None, max_results=50)	list[SpanRecord]	List recent root spans, optionally filtered by service
find_evaluated_trace_ids(trace_ids)	set[str]	Return subset of trace IDs that already have evaluation spans

Requires the [opensearch] extra: pip install opensearch-genai-observability-sdk-py[opensearch]

Auto-Instrumented Libraries

register() automatically discovers and activates any installed instrumentor packages via OTel entry points. No code changes needed — install the extras for the providers you use and their calls are traced automatically.

Category	Extras / packages
LLM providers	[openai], [anthropic]
Cloud AI	[bedrock], [google] (Vertex AI + Generative AI)
Frameworks	[langchain], [llamaindex]
All of the above + more	[otel-instrumentors]

[otel-instrumentors] includes all of the above plus Cohere, Mistral, Groq, Ollama, Together, Replicate, Writer, Voyage AI, Aleph Alpha, SageMaker, watsonx, Haystack, CrewAI, Agno, MCP, Transformers, ChromaDB, Pinecone, Qdrant, Weaviate, Milvus, LanceDB, and Marqo.

Configuration

Environment Variable	Description	Default
OTEL_EXPORTER_OTLP_TRACES_ENDPOINT	Full OTLP traces endpoint URL	—
OTEL_EXPORTER_OTLP_ENDPOINT	Base OTLP endpoint URL (/v1/traces appended)	—
OTEL_EXPORTER_OTLP_TRACES_PROTOCOL	Protocol for traces (http/protobuf, grpc)	—
OTEL_EXPORTER_OTLP_PROTOCOL	Protocol for all signals (http/protobuf, grpc)	—
OTEL_SERVICE_NAME	Service name for spans	"default"
OPENSEARCH_PROJECT	Project/service name (fallback)	"default"
AWS_DEFAULT_REGION	AWS region for SigV4 signing	auto-detected

When no endpoint env var is set, register() defaults to the Data Prepper endpoint: http://localhost:21890/opentelemetry/v1/traces.

Examples

See the examples/ directory:

Example	Description
01_tracing_basics.py	@observe decorator, context manager, enrich()
02_scoring.py	Span-level, trace-level, and session-level scoring
03_aws_sigv4.py	AWS SigV4 authentication with AWSSigV4OTLPExporter
04_async_tracing.py	Async function tracing with @observe
05_openai_auto_instrument.py	OpenAI auto-instrumentation via register()
06_retrieval_and_eval.py	Retrieve traces from OpenSearch, evaluate, write scores back

License

Apache-2.0