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'.
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:passstring
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>" }
]