Parsing error on mdadm reshape

[jasonaowen]

The md_info_detail.sh script generates output that node-exporter fails to parse when a md device is being reshaped.

Error message:

prometheus-node-exporter[4249]: ts=2025-05-08T20:54:34.079Z caller=textfile.go:227 level=error collector=textfile msg="failed to collect textfile data" file=md_info_detail.prom err="failed to parse textfile data from \"/var/lib/prometheus/node-exporter/md_info_detail.prom\": text format parsing error in line 36: expected float as value, got \"2,\""

Line 36 of /var/lib/prometheus/node-exporter/md_info_detail.prom:

node_md_info_DeltaDevices{md_device="md1", md_name="1", raid_level="6", md_num_raid_disks="6 (4)", md_metadata_version="1.2"} 2,

mdadm -D output (partially redacted):

           Version : 1.2
     Creation Time : ...
        Raid Level : raid6
        Array Size : ...
     Used Dev Size : ...
      Raid Devices : 6
     Total Devices : 6
       Persistence : Superblock is persistent

     Intent Bitmap : Internal

       Update Time : ...
             State : clean, reshaping 
    Active Devices : 6
   Working Devices : 6
    Failed Devices : 0
     Spare Devices : 0

            Layout : left-symmetric
        Chunk Size : 64K

Consistency Policy : bitmap

    Reshape Status : ...% complete
     Delta Devices : 2, (4->6)

Version info:

$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 12 (bookworm)
Release:        12
Codename:       bookworm
$ /sbin/mdadm --version
mdadm - v4.2 - 2021-12-30 - Debian 4.2-5
$ apt policy prometheus-node-exporter prometheus-node-exporter-collectors 
prometheus-node-exporter:
  Installed: 1.5.0-1+b6
  Candidate: 1.5.0-1+b6
prometheus-node-exporter-collectors:
  Installed: 0.0~git20230203.6f710f8-1+deb12u2
  Candidate: 0.0~git20230203.6f710f8-1+deb12u2

I believe this is the command generating that text:

node-exporter-textfile-collector-scripts/md_info_detail.sh

Lines 65 to 69 in b36a2ea

	if echo "$line" | grep -E -q "Devices :|Array Size :| Used Dev Size :|Events :"; then
	MDADM_DETAIL_KEY=$(echo "$line" | cut -d ":" -f 1 | tr -cd '[a-zA-Z0-9]._-')
	MDADM_DETAIL_VALUE=$(echo "$line" | cut -d ":" -f 2 | cut -d " " -f 2 | sed 's:^ ::')
	echo "node_md_info_${MDADM_DETAIL_KEY}{md_device=\"${MD_DEVICE_NUM}\", md_name=\"${MD_DEVICE}\", raid_level=\"${MD_LEVEL}\", md_num_raid_disks=\"${MD_NUM_RAID_DISKS}\", md_metadata_version=\"${MD_METADATA_VERSION}\"} ${MDADM_DETAIL_VALUE}"
	fi