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process.go
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process.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 darwin || freebsd || linux || windows || aix
package process
import (
"fmt"
"os"
"runtime"
"github.com/elastic/beats/v7/metricbeat/mb"
"github.com/elastic/beats/v7/metricbeat/mb/parse"
"github.com/elastic/elastic-agent-libs/logp"
"github.com/elastic/elastic-agent-system-metrics/metric/system/cgroup"
"github.com/elastic/elastic-agent-system-metrics/metric/system/process"
"github.com/elastic/elastic-agent-system-metrics/metric/system/resolve"
)
var debugf = logp.NewLogger("system.process").Debugf
func init() {
mb.Registry.MustAddMetricSet("system", "process", New,
mb.WithHostParser(parse.EmptyHostParser),
mb.DefaultMetricSet(),
)
}
// MetricSet that fetches process metrics.
type MetricSet struct {
mb.BaseMetricSet
stats *process.Stats
perCPU bool
setpid int
}
// New creates and returns a new MetricSet.
func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
config := defaultConfig
if err := base.Module().UnpackConfig(&config); err != nil {
return nil, err
}
sys := base.Module().(resolve.Resolver)
enableCgroups := false
if runtime.GOOS == "linux" {
if config.Cgroups == nil || *config.Cgroups {
enableCgroups = true
debugf("process cgroup data collection is enabled, using hostfs='%v'", sys.ResolveHostFS(""))
}
}
if config.Pid != 0 && config.Procs[0] != ".*" {
logp.L().Warnf("`process.pid` set to %d, but `processes` is set to a non-default value. Metricset will only report metrics for pid %d", config.Pid, config.Pid)
}
m := &MetricSet{
BaseMetricSet: base,
stats: &process.Stats{
Procs: config.Procs,
Hostfs: sys,
EnvWhitelist: config.EnvWhitelist,
CPUTicks: config.IncludeCPUTicks || (config.CPUTicks != nil && *config.CPUTicks),
CacheCmdLine: config.CacheCmdLine,
IncludeTop: config.IncludeTop,
EnableCgroups: enableCgroups,
CgroupOpts: cgroup.ReaderOptions{
RootfsMountpoint: sys,
IgnoreRootCgroups: true,
},
},
perCPU: config.IncludePerCPU,
}
m.setpid = config.Pid
// If hostfs is set, we may not want to force the hierarchy override, as the user could be expecting a custom path.
if !sys.IsSet() {
override, isset := os.LookupEnv("LIBBEAT_MONITORING_CGROUPS_HIERARCHY_OVERRIDE")
if isset {
m.stats.CgroupOpts.CgroupsHierarchyOverride = override
}
}
err := m.stats.Init()
if err != nil {
return nil, err
}
return m, nil
}
// Fetch fetches metrics for all processes. It iterates over each PID and
// collects process metadata, CPU metrics, and memory metrics.
func (m *MetricSet) Fetch(r mb.ReporterV2) error {
// monitor either a single PID, or the configured set of processes.
if m.setpid == 0 {
procs, roots, err := m.stats.Get()
if err != nil {
return fmt.Errorf("process stats: %w", err)
}
for evtI := range procs {
isOpen := r.Event(mb.Event{
MetricSetFields: procs[evtI],
RootFields: roots[evtI],
})
if !isOpen {
return nil
}
}
} else {
proc, root, err := m.stats.GetOneRootEvent(m.setpid)
if err != nil {
return fmt.Errorf("error fetching pid %d: %w", m.setpid, err)
}
r.Event(mb.Event{
MetricSetFields: proc,
RootFields: root,
})
}
return nil
}