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prometheus-node-exporter-lua: add filesystem metrics
Add a collector for the various fileystem metrics which matches the node-exporter behaviour. This collector supports the following metrics: * node_filesystem_size_bytes * node_filesystem_free_bytes * node_filesystem_avail_bytes * node_filesystem_files * node_filesystem_files_free * node_filesystem_readonly Signed-off-by: Will May <will.j.may@gmail.com>
This commit is contained in:
Will May
committed by
Etienne Champetier
Etienne Champetier
parent
1b18489df8
commit
eba5a9c4da
@@ -4,7 +4,7 @@
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include $(TOPDIR)/rules.mk
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PKG_NAME:=prometheus-node-exporter-lua
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PKG_VERSION:=2026.05.06
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PKG_VERSION:=2026.05.07
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PKG_RELEASE:=1
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PKG_MAINTAINER:=Etienne CHAMPETIER <champetier.etienne@gmail.com>
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@@ -81,6 +81,17 @@ define Package/prometheus-node-exporter-lua-dawn/install
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$(INSTALL_DATA) ./files/usr/lib/lua/prometheus-collectors/dawn.lua $(1)/usr/lib/lua/prometheus-collectors/
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endef
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define Package/prometheus-node-exporter-lua-filesystem
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$(call Package/prometheus-node-exporter-lua/Default)
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TITLE+= (filesystem collector)
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DEPENDS:=prometheus-node-exporter-lua +luci-lib-nixio
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endef
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define Package/prometheus-node-exporter-lua-filesystem/install
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$(INSTALL_DIR) $(1)/usr/lib/lua/prometheus-collectors
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$(INSTALL_BIN) ./files/usr/lib/lua/prometheus-collectors/filesystem.lua $(1)/usr/lib/lua/prometheus-collectors/
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endef
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define Package/prometheus-node-exporter-lua-hostapd_stations
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$(call Package/prometheus-node-exporter-lua/Default)
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TITLE+= (hostapd_stations collector) - Requires a full hostapd / wpad build
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@@ -293,6 +304,7 @@ endef
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$(eval $(call BuildPackage,prometheus-node-exporter-lua))
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$(eval $(call BuildPackage,prometheus-node-exporter-lua-bmx7))
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$(eval $(call BuildPackage,prometheus-node-exporter-lua-dawn))
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$(eval $(call BuildPackage,prometheus-node-exporter-lua-filesystem))
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$(eval $(call BuildPackage,prometheus-node-exporter-lua-hostapd_stations))
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$(eval $(call BuildPackage,prometheus-node-exporter-lua-hostapd_ubus_stations))
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$(eval $(call BuildPackage,prometheus-node-exporter-lua-hwmon))
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+85
@@ -0,0 +1,85 @@
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-- depends on luci-lib-nixio
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local nix = require "nixio"
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local function scrape()
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-- node exporter description - Filesystem size in bytes
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local metric_size_bytes = metric("node_filesystem_size_bytes", "gauge")
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-- node exporter description - Filesystem free space in bytes
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local metric_free_bytes = metric("node_filesystem_free_bytes", "gauge")
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-- node exporter description - Filesystem space available to non-root users in bytes
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local metric_avail_bytes = metric("node_filesystem_avail_bytes", "gauge")
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-- node exporter description - Filesystem total file nodes
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local metric_files = metric("node_filesystem_files", "gauge")
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-- node exporter description - Filesystem total free file nodes
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local metric_files_free = metric("node_filesystem_files_free", "gauge")
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-- node exporter description - Filesystem read-only status
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local metric_readonly = metric("node_filesystem_readonly", "gauge")
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for e in io.lines("/proc/self/mounts") do
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local fields = space_split(e)
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local device = fields[1]
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local mount_point = fields[2]
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local fs_type = fields[3]
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-- Filter list from node exporter:
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-- https://github.com/prometheus/node_exporter/blob/b9d0932179a0c5b3a8863f3d6cdafe8584cedc8e/collector/filesystem_linux.go#L36-L37
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if mount_point:find("/dev/?", 1) ~= 1
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and mount_point:find("/proc/?", 1) ~= 1
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and mount_point:find("/run/credentials/?", 1) ~= 1
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and mount_point:find("/sys/?", 1) ~= 1
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and mount_point:find("/var/lib/docker/?", 1) ~= 1
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and mount_point:find("/var/lib/containers/storage/?", 1) ~= 1
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and fs_type ~= "autofs"
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and fs_type ~= "binfmt_misc"
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and fs_type ~= "bpf"
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and fs_type ~= "cgroup"
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and fs_type ~= "cgroup2"
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and fs_type ~= "configfs"
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and fs_type ~= "debugfs"
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and fs_type ~= "devpts"
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and fs_type ~= "devtmpfs"
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and fs_type ~= "fusectl"
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and fs_type ~= "hugetlbfs"
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and fs_type ~= "iso9660"
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and fs_type ~= "mqueue"
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and fs_type ~= "nsfs"
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and fs_type ~= "overlay"
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and fs_type ~= "proc"
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and fs_type ~= "procfs"
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and fs_type ~= "pstore"
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and fs_type ~= "rpc_pipefs"
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and fs_type ~= "securityfs"
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and fs_type ~= "selinuxfs"
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and fs_type ~= "squashfs"
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and fs_type ~= "sysfs"
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and fs_type ~= "tracefs" then
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-- note that this excludes / as it's an overlay filesystem
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local stat = nix.fs.statvfs(mount_point)
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-- https://github.com/torvalds/linux/blob/e5fa841af679cb830da6c609c740a37bdc0b8b35/include/linux/statfs.h#L31
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local ST_RDONLY = 0x001
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local labels = {
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device = device,
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fstype = fs_type,
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mountpoint = mount_point,
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}
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local ro = 0
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if (nix.bit.band(stat.flag, ST_RDONLY)) == 1 then
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ro = 1
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end
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metric_size_bytes(labels, stat.blocks * stat.bsize)
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metric_free_bytes(labels, stat.bfree * stat.bsize)
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metric_avail_bytes(labels, stat.bavail * stat.bsize)
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metric_files(labels, stat.files)
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metric_files_free(labels, stat.ffree)
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metric_readonly(labels, ro)
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end
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end
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end
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return { scrape = scrape }
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