Revert "monitoring: adjust thresholds for disk_space_remaining (#11988)"
Created by: bobheadxi
This reverts commit c08ce9a7ef017f9663560ef6e7b55b1ff20e4d8f.
Upon further assessment @ https://github.com/sourcegraph/sourcegraph/issues/12011 , seems like it might be best to keep these thresholds as-is and try and address the underlying issues (eg https://github.com/sourcegraph/sourcegraph/issues/12014 , https://github.com/sourcegraph/sourcegraph/issues/9359) or silence them on dot-com (https://github.com/sourcegraph/sourcegraph/issues/11210)