llama-stack-mirror/docs/source/experimental/telemetry/index.md

Telemetry

The telemetry system is currently experimental and subject to change. We welcome feedback and contributions to help improve it.

The Llama Stack telemetry system provides comprehensive tracing, metrics, and logging capabilities. It supports multiple sink types including OpenTelemetry, SQLite, and Console output.

Key Concepts

Events

The telemetry system supports three main types of events:

• Unstructured Log Events: Free-form log messages with severity levels
• Metric Events: Numerical measurements with units
• Structured Log Events: System events like span start/end

Spans and Traces

• Spans: Represent operations with timing and hierarchical relationships
• Traces: Collection of related spans forming a complete request flow

Sinks

• OpenTelemetry: Send events to an OpenTelemetry Collector. This is useful for visualizing traces in a service like Jaeger.
• SQLite: Store events in a local SQLite database. This is needed if you want to query the events later through the Llama Stack API.
• Console: Print events to the console.

APIs

The telemetry system exposes the following HTTP endpoints:

Log Event

POST /telemetry/log-event

Logs a telemetry event (unstructured log, metric, or structured log) with optional TTL.

Query Traces

POST /telemetry/query-traces

Retrieves traces based on filters with pagination support. Parameters:

• attribute_filters: List of conditions to filter traces
• limit: Maximum number of traces to return (default: 100)
• offset: Number of traces to skip (default: 0)
• order_by: List of fields to sort by

Get Span Tree

POST /telemetry/get-span-tree

Retrieves a hierarchical view of spans starting from a specific span. Parameters:

• span_id: ID of the root span to retrieve
• attributes_to_return: Optional list of specific attributes to include
• max_depth: Optional maximum depth of the span tree to return

Providers

Meta-Reference Provider

Currently, only the meta-reference provider is implemented. It can be configured to send events to three sink types:

1. OpenTelemetry Collector
2. SQLite
3. Console

Configuration

  telemetry:
  - provider_id: meta-reference
    provider_type: inline::meta-reference
    config:
      sinks: ['console', 'sqlite', 'otel']
      otel_endpoint: "http://localhost:4318/v1/traces"
      sqlite_db_path: "/path/to/telemetry.db"

Jaeger to visualize traces

Start a Jaeger instance with the OTLP HTTP endpoint at 4318 and the Jaeger UI at 16686 using the following command:

docker run -d \
  --name jaeger \
  -p 6831:6831/udp \
  -p 14268:14268 \
  -p 16686:16686 \
  -p 4317:4317 \
  -p 4318:4318 \
  -e COLLECTOR_ZIPKIN_HOST_PORT=:9411 \
  -e COLLECTOR_OTLP_ENABLED=true \
  jaegertracing/all-in-one:latest

Once the Jaeger instance is running, you can visualize traces by navigating to http://localhost:16686.

Querying Examples

Querying Traces for a agent session

 curl -X POST 'http://localhost:5000/alpha/telemetry/query-traces' \
-H 'Content-Type: application/json' \
-d '{
  "attribute_filters": [
    {
      "key": "session_id",
      "op": "eq",
      "value": "dd667b87-ca4b-4d30-9265-5a0de318fc65" }],
  "limit": 100,
  "offset": 0,
  "order_by": ["start_time"]

  [
  {
    "trace_id": "6902f54b83b4b48be18a6f422b13e16f",
    "root_span_id": "5f37b85543afc15a",
    "start_time": "2024-12-04T08:08:30.501587",
    "end_time": "2024-12-04T08:08:36.026463"
  },
  ........
]
}'

Querying spans for a specifc root span id

curl -X POST 'http://localhost:5000/alpha/telemetry/get-span-tree' \
-H 'Content-Type: application/json' \
-d '{ "span_id" : "6cceb4b48a156913", "max_depth": 2 }'

{
  "span_id": "6cceb4b48a156913",
  "trace_id": "dafa796f6aaf925f511c04cd7c67fdda",
  "parent_span_id": "892a66d726c7f990",
  "name": "retrieve_rag_context",
  "start_time": "2024-12-04T09:28:21.781995",
  "end_time": "2024-12-04T09:28:21.913352",
  "attributes": {
    "input": [
      "{\"role\":\"system\",\"content\":\"You are a helpful assistant\"}",
      "{\"role\":\"user\",\"content\":\"What are the top 5 topics that were explained in the documentation? Only list succinct bullet points.\",\"context\":null}"
    ]
  },
  "children": [
    {
      "span_id": "1a2df181854064a8",
      "trace_id": "dafa796f6aaf925f511c04cd7c67fdda",
      "parent_span_id": "6cceb4b48a156913",
      "name": "MemoryRouter.query_documents",
      "start_time": "2024-12-04T09:28:21.787620",
      "end_time": "2024-12-04T09:28:21.906512",
      "attributes": {
        "input": null
      },
      "children": [],
      "status": "ok"
    }
  ],
  "status": "ok"
}