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// Copyright 2016 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build linux
// +build !nozfs
package collector
import (
"errors"
"strings"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
)
var errZFSNotAvailable = errors.New("ZFS / ZFS statistics are not available")
type zfsSysctl string
func init() {
registerCollector("zfs", defaultEnabled, NewZFSCollector)
}
type zfsCollector struct {
linuxProcpathBase string
linuxZpoolIoPath string
linuxPathMap map[string]string
}
// NewZFSCollector returns a new Collector exposing ZFS statistics.
func NewZFSCollector() (Collector, error) {
return &zfsCollector{
linuxProcpathBase: "spl/kstat/zfs",
linuxZpoolIoPath: "/*/io",
linuxPathMap: map[string]string{
"zfs_abd": "abdstats",
"zfs_arc": "arcstats",
"zfs_dbuf": "dbuf_stats",
"zfs_dmu_tx": "dmu_tx",
"zfs_dnode": "dnodestats",
"zfs_fm": "fm",
"zfs_vdev_cache": "vdev_cache_stats", // vdev_cache is deprecated
"zfs_vdev_mirror": "vdev_mirror_stats",
"zfs_xuio": "xuio_stats", // no known consumers of the XUIO interface on Linux exist
"zfs_zfetch": "zfetchstats",
"zfs_zil": "zil",
},
}, nil
}
func (c *zfsCollector) Update(ch chan<- prometheus.Metric) error {
for subsystem := range c.linuxPathMap {
if err := c.updateZfsStats(subsystem, ch); err != nil {
if err == errZFSNotAvailable {
log.Debug(err)
// ZFS /proc files are added as new features to ZFS arrive, it is ok to continue
continue
}
return err
}
}
// Pool stats
return c.updatePoolStats(ch)
}
func (s zfsSysctl) metricName() string {
parts := strings.Split(string(s), ".")
return strings.Replace(parts[len(parts)-1], "-", "_", -1)
}
func (c *zfsCollector) constSysctlMetric(subsystem string, sysctl zfsSysctl, value uint64) prometheus.Metric {
metricName := sysctl.metricName()
return prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, metricName),
string(sysctl),
nil,
nil,
),
prometheus.UntypedValue,
float64(value),
)
}
func (c *zfsCollector) constPoolMetric(poolName string, sysctl zfsSysctl, value uint64) prometheus.Metric {
metricName := sysctl.metricName()
return prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(namespace, "zfs_zpool", metricName),
string(sysctl),
[]string{"zpool"},
nil,
),
prometheus.UntypedValue,
float64(value),
poolName,
)
}
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