As the error says, you are using unsupported regex syntax. Prometheus
supports the syntax of the RE2 library:
https://github.com/google/re2/wiki/Syntax
For more complex ways of combining drop/keep expressions, you can use __tmp
labels. Here is an example which doesn't solve your particular problem
exactly, but gives an example of how it can be used:
# On docker hosts we get many tmpfs/aufs filesystem; lots of NFS
mounts too,
# plus ext4 bind mounts under /run/docker/runtime-runs/moby/
# Drop all of these, except keep node_filesystem_readonly for NFS
mounts.
- source_labels: [__name__, fstype]
regex: 'node_filesystem_readonly;(nfs|nfs4|.*gluster.*)'
target_label: __tmp_keep
replacement: Y
- source_labels: [__tmp_keep, fstype]
regex: ';(aufs|tmpfs|nfs|nfs4|fuse.lxcfs|.*gluster.*)'
action: drop
- source_labels: [__tmp_keep, mountpoint]
regex: ';(/run/.*)'
action: drop
- regex: '__tmp.*'
action: labeldrop
I wanted to drop all labels with specific fstype and mountpoint values,
*except* I wanted to keep the node_filesystem_readonly metrics for certain
filesystem types.
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