Use PG version represented as an integer internally insteead of
the float (float comparisons are imprecise). Instead of passing
one version of the disk stat collector pass one version per each
cluster (since wal directories are per cluster). Minor refactoring.
Use PG version represented as an integer internally insteead of the float (float comparisons are imprecise). Instead of passing one version of the disk stat collector pass one version per each cluster (since wal directories are per cluster). Minor refactoring.
Fixes #88