The AI engine translates pydantic-ai OpenTelemetry spans into PostHog `$ai_generation`/`$ai_trace` events via a custom SpanProcessor. Two gaps in that path let LLM telemetry stop silently and stay at zero: - `PostHogSpanProcessor.on_end` was unguarded. OpenTelemetry calls it synchronously from `Span.end()` with no exception handling of its own, and pydantic-ai ends the model span inside a `with` block, so any error while translating a span propagates into the model request itself. A telemetry defect could therefore break the agent run and/or halt emission for every subsequent span. It now translates and captures defensively and logs-and-drops on failure. - The PostHog client was created without an `on_error` callback. Its `capture` is decorated `@no_throw` and delivery happens on a background consumer thread, so a failing or stalled delivery pipeline was completely invisible. We now log delivery failures and log the enabled/disabled state at startup, so a halt is noticeable in minutes instead of going unnoticed. Adds unit tests covering the happy path, per-trace dedup, non-chat spans, and that `on_end` never raises on delivery failure or a malformed span. Generated-By: PostHog Code Task-Id: 505d85dd-9cd2-4258-b76a-e027f4240277
Stirling PDF - The Open-Source PDF Platform
Stirling PDF is a powerful, open-source PDF editing platform. Run it as a personal desktop app, in the browser, or deploy it on your own servers with a private API. Edit, sign, redact, convert, and automate PDFs without sending documents to external services.
Key Capabilities
- Everywhere you work - Desktop client, browser UI, and self-hosted server with a private API.
- 50+ PDF tools - Edit, merge, split, sign, redact, convert, OCR, compress, and more.
- Automation & workflows - No-code pipelines direct in UI with APIs to process millions of PDFs.
- Enterprise‑grade - SSO, auditing, and flexible on‑prem deployments.
- Developer platform - REST APIs available for nearly all tools to integrate into your existing systems.
- Global UI - Interface available in 40+ languages.
For a full feature list, see the docs: https://docs.stirlingpdf.com
Quick Start
docker run -p 8080:8080 docker.stirlingpdf.com/stirlingtools/stirling-pdf
Then open: http://localhost:8080
For full installation options (including desktop and Kubernetes), see our Documentation Guide.
Resources
Support
- Community: Discord
- Bug Reports: GitHub Issues
Contributing
We welcome contributions! Please see CONTRIBUTING.md for guidelines.
This project uses Task as a unified command runner for all build, dev, and test commands. Run task dev to get started running the editor, run task to see the most common commands, or see the Developer Guide for full details.
For adding translations, see the Translation Guide.
License
Stirling PDF is open-core. See LICENSE for details.

