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Exporter for machine metrics
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node_exporter/collector/nfsd_linux.go

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// Copyright 2018 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.
//go:build !nonfsd
// +build !nonfsd
package collector
import (
"errors"
"fmt"
"log/slog"
"os"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/procfs/nfs"
)
// A nfsdCollector is a Collector which gathers metrics from /proc/net/rpc/nfsd.
// See: https://www.svennd.be/nfsd-stats-explained-procnetrpcnfsd/
type nfsdCollector struct {
fs nfs.FS
requestsDesc *prometheus.Desc
logger *slog.Logger
}
func init() {
registerCollector("nfsd", defaultEnabled, NewNFSdCollector)
}
const (
nfsdSubsystem = "nfsd"
)
// NewNFSdCollector returns a new Collector exposing /proc/net/rpc/nfsd statistics.
func NewNFSdCollector(logger *slog.Logger) (Collector, error) {
fs, err := nfs.NewFS(*procPath)
if err != nil {
return nil, fmt.Errorf("failed to open procfs: %w", err)
}
return &nfsdCollector{
fs: fs,
requestsDesc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, nfsdSubsystem, "requests_total"),
"Total number NFSd Requests by method and protocol.",
[]string{"proto", "method"}, nil,
),
logger: logger,
}, nil
}
// Update implements Collector.
func (c *nfsdCollector) Update(ch chan<- prometheus.Metric) error {
stats, err := c.fs.ServerRPCStats()
if err != nil {
if errors.Is(err, os.ErrNotExist) {
c.logger.Debug("Not collecting NFSd metrics", "err", err)
return ErrNoData
}
return fmt.Errorf("failed to retrieve nfsd stats: %w", err)
}
c.updateNFSdReplyCacheStats(ch, &stats.ReplyCache)
c.updateNFSdFileHandlesStats(ch, &stats.FileHandles)
c.updateNFSdInputOutputStats(ch, &stats.InputOutput)
c.updateNFSdThreadsStats(ch, &stats.Threads)
c.updateNFSdReadAheadCacheStats(ch, &stats.ReadAheadCache)
c.updateNFSdNetworkStats(ch, &stats.Network)
c.updateNFSdServerRPCStats(ch, &stats.ServerRPC)
c.updateNFSdRequestsv2Stats(ch, &stats.V2Stats)
c.updateNFSdRequestsv3Stats(ch, &stats.V3Stats)
c.updateNFSdRequestsv4Stats(ch, &stats.V4Ops)
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(stats.WdelegGetattr), "4", "WdelegGetattr")
return nil
}
// updateNFSdReplyCacheStats collects statistics for the reply cache.
func (c *nfsdCollector) updateNFSdReplyCacheStats(ch chan<- prometheus.Metric, s *nfs.ReplyCache) {
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(namespace, nfsdSubsystem, "reply_cache_hits_total"),
"Total number of NFSd Reply Cache hits (client lost server response).",
nil,
nil,
),
prometheus.CounterValue,
float64(s.Hits))
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(namespace, nfsdSubsystem, "reply_cache_misses_total"),
"Total number of NFSd Reply Cache an operation that requires caching (idempotent).",
nil,
nil,
),
prometheus.CounterValue,
float64(s.Misses))
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(namespace, nfsdSubsystem, "reply_cache_nocache_total"),
"Total number of NFSd Reply Cache non-idempotent operations (rename/delete/…).",
nil,
nil,
),
prometheus.CounterValue,
float64(s.NoCache))
}
// updateNFSdFileHandlesStats collects statistics for the file handles.
func (c *nfsdCollector) updateNFSdFileHandlesStats(ch chan<- prometheus.Metric, s *nfs.FileHandles) {
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(namespace, nfsdSubsystem, "file_handles_stale_total"),
"Total number of NFSd stale file handles",
nil,
nil,
),
prometheus.CounterValue,
float64(s.Stale))
// NOTE: Other FileHandles entries are unused in the kernel.
}
// updateNFSdInputOutputStats collects statistics for the bytes in/out.
func (c *nfsdCollector) updateNFSdInputOutputStats(ch chan<- prometheus.Metric, s *nfs.InputOutput) {
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(namespace, nfsdSubsystem, "disk_bytes_read_total"),
"Total NFSd bytes read.",
nil,
nil,
),
prometheus.CounterValue,
float64(s.Read))
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(namespace, nfsdSubsystem, "disk_bytes_written_total"),
"Total NFSd bytes written.",
nil,
nil,
),
prometheus.CounterValue,
float64(s.Write))
}
// updateNFSdThreadsStats collects statistics for kernel server threads.
func (c *nfsdCollector) updateNFSdThreadsStats(ch chan<- prometheus.Metric, s *nfs.Threads) {
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(namespace, nfsdSubsystem, "server_threads"),
"Total number of NFSd kernel threads that are running.",
nil,
nil,
),
prometheus.GaugeValue,
float64(s.Threads))
}
// updateNFSdReadAheadCacheStats collects statistics for the read ahead cache.
func (c *nfsdCollector) updateNFSdReadAheadCacheStats(ch chan<- prometheus.Metric, s *nfs.ReadAheadCache) {
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(namespace, nfsdSubsystem, "read_ahead_cache_size_blocks"),
"How large the read ahead cache is in blocks.",
nil,
nil,
),
prometheus.GaugeValue,
float64(s.CacheSize))
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(namespace, nfsdSubsystem, "read_ahead_cache_not_found_total"),
"Total number of NFSd read ahead cache not found.",
nil,
nil,
),
prometheus.CounterValue,
float64(s.NotFound))
}
// updateNFSdNetworkStats collects statistics for network packets/connections.
func (c *nfsdCollector) updateNFSdNetworkStats(ch chan<- prometheus.Metric, s *nfs.Network) {
packetDesc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, nfsdSubsystem, "packets_total"),
"Total NFSd network packets (sent+received) by protocol type.",
[]string{"proto"},
nil,
)
ch <- prometheus.MustNewConstMetric(
packetDesc,
prometheus.CounterValue,
float64(s.UDPCount), "udp")
ch <- prometheus.MustNewConstMetric(
packetDesc,
prometheus.CounterValue,
float64(s.TCPCount), "tcp")
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(namespace, nfsdSubsystem, "connections_total"),
"Total number of NFSd TCP connections.",
nil,
nil,
),
prometheus.CounterValue,
float64(s.TCPConnect))
}
// updateNFSdServerRPCStats collects statistics for kernel server RPCs.
func (c *nfsdCollector) updateNFSdServerRPCStats(ch chan<- prometheus.Metric, s *nfs.ServerRPC) {
badRPCDesc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, nfsdSubsystem, "rpc_errors_total"),
"Total number of NFSd RPC errors by error type.",
[]string{"error"},
nil,
)
ch <- prometheus.MustNewConstMetric(
badRPCDesc,
prometheus.CounterValue,
float64(s.BadFmt), "fmt")
ch <- prometheus.MustNewConstMetric(
badRPCDesc,
prometheus.CounterValue,
float64(s.BadAuth), "auth")
ch <- prometheus.MustNewConstMetric(
badRPCDesc,
prometheus.CounterValue,
float64(s.BadcInt), "cInt")
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(namespace, nfsdSubsystem, "server_rpcs_total"),
"Total number of NFSd RPCs.",
nil,
nil,
),
prometheus.CounterValue,
float64(s.RPCCount))
}
// updateNFSdRequestsv2Stats collects statistics for NFSv2 requests.
func (c *nfsdCollector) updateNFSdRequestsv2Stats(ch chan<- prometheus.Metric, s *nfs.V2Stats) {
const proto = "2"
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.GetAttr), proto, "GetAttr")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.SetAttr), proto, "SetAttr")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Root), proto, "Root")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Lookup), proto, "Lookup")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.ReadLink), proto, "ReadLink")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Read), proto, "Read")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.WrCache), proto, "WrCache")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Write), proto, "Write")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Create), proto, "Create")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Remove), proto, "Remove")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Rename), proto, "Rename")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Link), proto, "Link")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.SymLink), proto, "SymLink")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.MkDir), proto, "MkDir")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.RmDir), proto, "RmDir")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.ReadDir), proto, "ReadDir")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.FsStat), proto, "FsStat")
}
// updateNFSdRequestsv3Stats collects statistics for NFSv3 requests.
func (c *nfsdCollector) updateNFSdRequestsv3Stats(ch chan<- prometheus.Metric, s *nfs.V3Stats) {
const proto = "3"
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.GetAttr), proto, "GetAttr")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.SetAttr), proto, "SetAttr")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Lookup), proto, "Lookup")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Access), proto, "Access")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.ReadLink), proto, "ReadLink")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Read), proto, "Read")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Write), proto, "Write")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Create), proto, "Create")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.MkDir), proto, "MkDir")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.SymLink), proto, "SymLink")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.MkNod), proto, "MkNod")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Remove), proto, "Remove")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.RmDir), proto, "RmDir")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Rename), proto, "Rename")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Link), proto, "Link")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.ReadDir), proto, "ReadDir")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.ReadDirPlus), proto, "ReadDirPlus")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.FsStat), proto, "FsStat")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.FsInfo), proto, "FsInfo")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.PathConf), proto, "PathConf")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Commit), proto, "Commit")
}
// updateNFSdRequestsv4Stats collects statistics for NFSv4 requests.
func (c *nfsdCollector) updateNFSdRequestsv4Stats(ch chan<- prometheus.Metric, s *nfs.V4Ops) {
const proto = "4"
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Access), proto, "Access")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Close), proto, "Close")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Commit), proto, "Commit")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Create), proto, "Create")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.DelegPurge), proto, "DelegPurge")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.DelegReturn), proto, "DelegReturn")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.GetAttr), proto, "GetAttr")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.GetFH), proto, "GetFH")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Link), proto, "Link")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Lock), proto, "Lock")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Lockt), proto, "Lockt")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Locku), proto, "Locku")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Lookup), proto, "Lookup")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.LookupRoot), proto, "LookupRoot")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Nverify), proto, "Nverify")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Open), proto, "Open")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.OpenAttr), proto, "OpenAttr")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.OpenConfirm), proto, "OpenConfirm")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.OpenDgrd), proto, "OpenDgrd")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.PutFH), proto, "PutFH")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Read), proto, "Read")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.ReadDir), proto, "ReadDir")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.ReadLink), proto, "ReadLink")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Remove), proto, "Remove")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Rename), proto, "Rename")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Renew), proto, "Renew")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.RestoreFH), proto, "RestoreFH")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.SaveFH), proto, "SaveFH")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.SecInfo), proto, "SecInfo")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.SetAttr), proto, "SetAttr")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.SetClientID), proto, "SetClientID")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.SetClientIDConfirm), proto, "SetClientIDConfirm")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Verify), proto, "Verify")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.Write), proto, "Write")
ch <- prometheus.MustNewConstMetric(c.requestsDesc, prometheus.CounterValue,
float64(s.RelLockOwner), proto, "RelLockOwner")
}