Fixed review requested change.

Signed-off-by: Eric D. Schabell <[email protected]>

Author: eschabell

pipeline/inputs/node-exporter-metrics.md

@@ -59,7 +59,7 @@ This helps with down-sampling when collecting metrics.
 | `diskstats.ignore_device_regex` | Specify the regular expression for the` diskstats` to prevent collection of/ignore. | `^(ram\|loop\|fd\|(h\|s\|v\|xv)d[a-z]\|nvme\\d+n\\d+p)\\d+$` |
 | `filesystem.ignore_filesystem_type_regex` | Specify the regular expression for the `filesystem` types to prevent collection of or ignore. | `^(autofs\|binfmt_misc\|bpf\|cgroup2?\|configfs\|debugfs\|devpts\|devtmpfs\|fusectl\|hugetlbfs\|iso9660\|mqueue\|nsfs\|overlay\|proc\|procfs\|pstore\|rpc_pipefs\|securityfs\|selinuxfs\|squashfs\|sysfs\|tracefs)$` |
 | `filesystem.ignore_mount_point_regex` | Specify the regular expression for the `mount` points to prevent collection of/ignore. | `^/(dev\|proc\|run/credentials/.+\|sys\|var/lib/docker/.+\|var/lib/containers/storage/.+)($\|/)` |
-| `metrics` | Specify which metrics are collected from the host operating system. These metrics depend on `/procfs` or `/sysfs`. The actual values of metrics will be read from `/proc` or `/sys` when needed. `cpu`, `cpufreq`, `meminfo`, `diskstats`, `filesystem`, `stat`, `loadavg`, `vmstat`, `netdev`, `netstat`, `sockstat`, and `filefd` depend on `procfs`. `cpufreq` and `hwmon` metrics depend on `sysfs`. | `"cpu,cpufreq,meminfo,diskstats,filesystem,uname,stat,time,loadavg,vmstat,netdev,netstat,sockstat,filefd,systemd,nvme,thermal_zone,hwmon"` |
+| `metrics` | Specify which metrics are collected from the host operating system. These metrics depend on `/procfs`, `/sysfs`, systemd, or custom files. The actual values of metrics will be read from `/proc`, `/sys`, or systemd as needed. `cpu`, `cpufreq`, `meminfo`, `diskstats`, `filesystem`, `stat`, `loadavg`, `vmstat`, `netdev`, `netstat`, `sockstat`, `filefd`, `nvme`, and `processes` depend on `procfs`. `cpufreq`, `hwmon`, and `thermal_zone` depend on `sysfs`. `systemd` depends on systemd services. `textfile` requires explicit path configuration using `collector.textfile.path`. | `"cpu,cpufreq,meminfo,diskstats,filesystem,uname,stat,time,loadavg,vmstat,netdev,netstat,sockstat,filefd,systemd,nvme,thermal_zone,hwmon"` |
 | `path.procfs` | The mount point used to collect process information and metrics. | `/proc` |
 | `path.rootfs` | The root filesystem mount point. | `/` |
 | `path.sysfs` | The path in the filesystem used to collect system metrics. | `/sys` |