Loki Cloudflare Tail Worker

Post logs to loki from a Cloudflare Tail Worker.

Converts your logs and errors to JSON and POSTs them to env.LOKI_URL.

By using a Tail Worker we ship logs to Loki even in cases where the primary worker hits sub-request limits.

A single instance of this worker on your account can ship all your logs to a shared loki instance.

Each workers log stream is identified by a loki label worker: 'your-worker-name'.

Getting started

Deploy this worker to your account and set the secrets using wrangler secret put

• LOKI_URL - the url to post to e.g https://eg.grafana.net/loki/api/v1/push
• LOKI_TOKEN - basic auth token for loki: base64 encoded user:pass string

Configure this worker as a tail_consumer in any other workers whose logs you want to send to Loki.

other worker wrangler.toml

tail_consumers = [
  { service = "loki-<env>" }
]