Disk

Monitor storage capacity, inode availability, and I/O performance across all mounted partitions. This collector helps identify disk space exhaustion and I/O bottlenecks that can impact application performance.

Setup

Disk monitoring is enabled by default. The agent automatically discovers all mounted block devices and partitions upon startup. It ignores bind mounts and virtual filesystems to focus on physical storage.

Configuration

No configuration required.

Metrics

Metric	Type	Unit	Description
disk_total_bytes	Gauge	bytes	Total storage capacity of the partition.
disk_used_bytes	Gauge	bytes	Amount of used storage space.
disk_free_bytes	Gauge	bytes	Amount of available storage space.
disk_used_ratio	Gauge	%	Ratio of used storage (0.0 to 1.0).
disk_inodes_total_total	Gauge	-	Total number of inodes available.
disk_inodes_used_total	Gauge	-	Number of used inodes.
disk_inodes_free_total	Gauge	-	Number of free inodes.
disk_inodes_used_ratio	Gauge	%	Ratio of used inodes (0.0 to 1.0).
disk_read_rate	Gauge	reqs/s	Rate of read operations per second.
disk_write_rate	Gauge	reqs/s	Rate of write operations per second.
disk_read_bps	Gauge	bytes/s	Read throughput in bytes per second.
disk_write_bps	Gauge	bytes/s	Write throughput in bytes per second.
disk_busy_ratio	Gauge	%	Ratio of time the disk was busy (0.0 to 1.0).
disk_avg_request_ms	Gauge	ms	Average time per disk I/O request.

Labels

Label	Description	Example / Values
device	The underlying block device path.	/dev/sda1, C:
mountpoint	The directory where the device is mounted.	/, /data, C:\