Anis Elleuch 5fb420c703
prometheus: Add S3 4xx and 5xx S3 monitoring (#15052)
Currently minio_s3_requests_errors_total covers 4xx and 
5xx S3 responses which can be confusing when s3 applications 
sent a lot of HEAD requests with obvious 404 responses or 
when the replication is enabled.

Add 
- minio_s3_requests_4xx_errors_total
- minio_s3_requests_5xx_errors_total

to help users monitor 4xx and 5xx HTTP status codes separately.
2022-06-08 11:22:34 -07:00
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