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Mastra ships an OtelExporter that targets any OTLP endpoint. Wire it into your Mastra instance, then pass userId / conversationId per call.

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1. Install

Already have @mastra/observability and @mastra/otel-exporter? Skip. No Observability set up yet? 
npm install @mastra/observability @mastra/otel-exporter

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2. Wire the OtelExporter pointing at Agnost

Already have Mastra Observability? Append Agnost to the existing exporters array: Mastra fans traces out to every exporter in the list: 
import { OtelExporter } from '@mastra/otel-exporter';

const agnostExporter = new OtelExporter({
  provider: {
    custom: {
      endpoint: 'https://otel.agnost.ai/v1/traces',
      headers: { 'X-Agnost-Org-ID': process.env.AGNOST_ORG_ID! },
      protocol: 'http/protobuf',
    },
  },
});

// Inside your existing Observability config:
exporters: [
  // ...your existing exporters,
  agnostExporter,
]
No Observability yet? Full setup: 
import { Mastra } from '@mastra/core';
import { Observability } from '@mastra/observability';
import { OtelExporter } from '@mastra/otel-exporter';

export const mastra = new Mastra({
  agents: { agent },
  observability: new Observability({
    configs: {
      default: {
        serviceName: 'my-mastra-app',
        exporters: [
          new OtelExporter({
            provider: {
              custom: {
                endpoint: 'https://otel.agnost.ai/v1/traces',
                headers: { 'X-Agnost-Org-ID': process.env.AGNOST_ORG_ID! },
                protocol: 'http/protobuf',
              },
            },
          }),
        ],
      },
    },
  }),
});

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3. Pass userId / conversationId per call

await agent.generate('Hello', {
  tracingOptions: {
    metadata: {
      userId: 'user-42',
      conversationId: 'conv-abc123',
    },
  },
});
Reserved keys userId, conversationId, and threadId in tracingOptions.metadata are read by Agnost for user / session grouping.

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References