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node_exporter/collector/nfsd_linux.go
Tobias Klausmann 78af952e63
NFSd: handle new wdeleg_getattr attribute in /proc/net/rpc/nfsd (#2810) 
This attribute was introduced it v6.6-rc1.

The relevant changes in procfs were merged here:

https://github.com/prometheus/procfs/pull/574

and are part of procfs v0.11.2

I have also figured out that the stat should be part of the v4 ops
counters struct, but that will need changes to both procfs and this
code. Since people are already using 6.6-rc1, I think it's better to get
the code out there --- even if they don't care about wdeleg_getattr,
currently they get _no_ nfsd stats with 6.6-rc1.

I will make two follow-up PRs to clean this up in the next releases of
procfs and node-exporter.

Signed-off-by: Tobias Klausmann <klausman@schwarzvogel.de>
2023-11-14 03:54:11 +01:00

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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"
"os"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"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 log.Logger
}
func init() {
registerCollector("nfsd", defaultEnabled, NewNFSdCollector)
}
const (
nfsdSubsystem = "nfsd"
)
// NewNFSdCollector returns a new Collector exposing /proc/net/rpc/nfsd statistics.
func NewNFSdCollector(logger log.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) {
level.Debug(c.logger).Log("msg", "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")
}
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