nit: add missing diskSelector
to node_filesystem_files_free
#550
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IIUC, this doesn't change the behavior of this query at all (Prometheus will still only pick values for
node_filesystem_files_free
andnode_filesystem_files
where all the labels match), but perhaps makes it cleaner to read.I'm extremely new to PromQL, and I'm mostly filing this as a learning opportunity. Are there best practices around this sort of thing? Do we like the way this was written, and should I change our other expressions ot match (some of the other expressions use
${diskSelector}
twice).