InfluxDB line protocol

The output of s3mon is the InfluxDB line protocol, for example:

$ s3mon -c config.yml
s3mon,bucket=backup,prefix=backup error=0i,exist=1i,size_mismatch=1i
s3mon,bucket=random,prefix=abc error=0i,exist=1i,size_mismatch=0i
s3mon,bucket=foo,prefix=bar error=0i,exist=1i,size_mismatch=0i
s3mon,bucket=test,prefix=backup error=0i,exist=0i,size_mismatch=0i
s3mon,bucket=images,prefix=img error=0i,exist=1i,size_mismatch=0i

telegraf

s3mon could be called periodically from telegraf using this configuration:

[[inputs.exec]]
  command = "/path/to/s3mon -c /path/to/config.yml"
  interval = "1h"
  data_format = "influx"

grafana

You could use this dashboard and configure custom alerts: https://grafana.com/grafana/dashboards/11008