A webserver to trigger and backup Prometheus snapshots and expose backup status for prometheus scrapping.
The two endpoints are:
/metrics: for prometheus scrapping/snap: trigger the snap pipeline.
When you hit the /snap endpoint via a GET request, the server will start a snapshot pipeline that
will:
- start a Prometheus snapshot
- tarball the snapshot
- upload it to S3
The prom_backup_size gauge it is zero most of the time. When the server finishes a successfull
snapshot pipeline run, it sets the gauge to the size (in bytes) of the snapshot tarball. After a
few seconds (configurable option) it sets the gauge back to zero.
We can then use the gauge to determine when we did a successful snapshot backup.
By default the aws go sdk will load credentials from ~/.aws/credentials
To overwrite, set AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY
See the session package docs
for other variables and details.