Cloudflare OpenTelemetry exporter

Description

This worker was written to push Cloudflare Analytics data to an OpenTelemetry collector.

It is inspired by the cloudflare-exporter, which is unfortunately no longer maintained. By running it as a worker and pushing metrics, we avoid the need to deploy a dedicated container and allow the worker to be run on green compute.

Metrics currently supported

• Workers
• D1
• Durable Objects
• Queues
• Zones

Usage

• Clone the repo
• Modify the wrangler.toml file to include your Cloudflare account ID and API token and OTel collector endpoint
• Run npx wrangler deploy --env dev to deploy the worker

How it works

• Scrape the Cloudflare Analytics API via GraphQL
• Build the metrics in a Prometheus registry (ideally this would be directly with OTel, but ran into some challenges with threading and WASM for these SDKs)
• Convert the Prometheus registry to OTel metrics
• Push the OTel metrics to an OTel collector via protobuf (JSON encoding for OTel Metrics is broken in the Rust SDKs and is only used for testing)

Next steps

• Add more metrics
• Help improve OTel Rust SDKs and remove dependency on Prometheus