Add AWS_REGION as parameter

[thazlett]

Looking at the code it doesn't seem like this is a thing already.

Would it be possible to add the AWS_REGION is a URL parameter?

This would allow a single Prometheus job to scrape information about buckets in multiple regions from a single exporter. It seems that at the moment, you need to have an s3_exporter instance per aws region you have buckets of interest in.

Something like:
http://127.0.0.1:9340/probe?bucket=bucket-in-eu-west-1&prefix=bla&region=eu-west-1
http://127.0.0.1:9340/probe?bucket=bucket-in-eu-west-2&prefix=bla&region=eu-west-2

A job config target would look like this:

• bucket=bucket-in-eu-west-1;prefix=bla;region=eu-west-1;
• bucket=bucket-in-eu-west-2;prefix=bla;region=eu-west-1;

Really like this exporter!