fix: pass hostname through a trim filter before shipping

[hbjydev]

Changes

• Passes all instance labels using /etc/hostname as a source through the trim_space function to fix query errors, as /etc/hostname has a newline char at the end of it.

Source for help on the issue is Grafana Cloud support;

you will see the instance name is trailed by a " " which when replaced in the $instance variable causes the query payload to have a line break.

topk(25,irate(node_disk_io_time_seconds_total{job=~"integrations/(node_exporter|unix)",cluster=~".*",job=~".+",instance=~"ip-10-0-34-226
", device!=""}[4m0s]))

(Note that the " is on line two of the query, not on the end of line one)