mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-09-20 08:07:31 -07:00
3fb5f70b0c
Drop redundant GOOS build tags at start of file if the constraint is already specified by the filename, e.g. foo_GOOS.go or foo_GOOS_GOARCH.go, avoiding potential confusion in future. cf. https://pkg.go.dev/cmd/go#hdr-Build_constraints Signed-off-by: Daniel Swarbrick <daniel.swarbrick@gmail.com>
122 lines
3.5 KiB
Go
122 lines
3.5 KiB
Go
// Copyright 2022 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 !noslabinfo
|
|
// +build !noslabinfo
|
|
|
|
package collector
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/go-kit/log"
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
"github.com/prometheus/procfs"
|
|
)
|
|
|
|
type slabinfoCollector struct {
|
|
fs procfs.FS
|
|
logger log.Logger
|
|
subsystem string
|
|
labels []string
|
|
}
|
|
|
|
func init() {
|
|
registerCollector("slabinfo", defaultDisabled, NewSlabinfoCollector)
|
|
}
|
|
|
|
func NewSlabinfoCollector(logger log.Logger) (Collector, error) {
|
|
fs, err := procfs.NewFS(*procPath)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to open procfs: %w", err)
|
|
}
|
|
|
|
return &slabinfoCollector{logger: logger,
|
|
fs: fs,
|
|
subsystem: "slabinfo",
|
|
labels: []string{"slab"},
|
|
}, nil
|
|
}
|
|
|
|
func (c *slabinfoCollector) Update(ch chan<- prometheus.Metric) error {
|
|
slabinfo, err := c.fs.SlabInfo()
|
|
if err != nil {
|
|
return fmt.Errorf("couldn't get %s: %w", c.subsystem, err)
|
|
}
|
|
|
|
for _, slab := range slabinfo.Slabs {
|
|
ch <- c.activeObjects(slab.Name, slab.ObjActive)
|
|
ch <- c.objects(slab.Name, slab.ObjNum)
|
|
ch <- c.objectSizeBytes(slab.Name, slab.ObjSize)
|
|
ch <- c.objectsPerSlab(slab.Name, slab.ObjPerSlab)
|
|
ch <- c.pagesPerSlab(slab.Name, slab.PagesPerSlab)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (c *slabinfoCollector) activeObjects(label string, val int64) prometheus.Metric {
|
|
desc := prometheus.NewDesc(
|
|
prometheus.BuildFQName(namespace, c.subsystem, "active_objects"),
|
|
"The number of objects that are currently active (i.e., in use).",
|
|
c.labels, nil)
|
|
|
|
return prometheus.MustNewConstMetric(
|
|
desc, prometheus.GaugeValue, float64(val), label,
|
|
)
|
|
}
|
|
|
|
func (c *slabinfoCollector) objects(label string, val int64) prometheus.Metric {
|
|
desc := prometheus.NewDesc(
|
|
prometheus.BuildFQName(namespace, c.subsystem, "objects"),
|
|
"The total number of allocated objects (i.e., objects that are both in use and not in use).",
|
|
c.labels, nil)
|
|
|
|
return prometheus.MustNewConstMetric(
|
|
desc, prometheus.GaugeValue, float64(val), label,
|
|
)
|
|
}
|
|
|
|
func (c *slabinfoCollector) objectSizeBytes(label string, val int64) prometheus.Metric {
|
|
desc := prometheus.NewDesc(
|
|
prometheus.BuildFQName(namespace, c.subsystem, "object_size_bytes"),
|
|
"The size of objects in this slab, in bytes.",
|
|
c.labels, nil)
|
|
|
|
return prometheus.MustNewConstMetric(
|
|
desc, prometheus.GaugeValue, float64(val), label,
|
|
)
|
|
}
|
|
|
|
func (c *slabinfoCollector) objectsPerSlab(label string, val int64) prometheus.Metric {
|
|
desc := prometheus.NewDesc(
|
|
prometheus.BuildFQName(namespace, c.subsystem, "objects_per_slab"),
|
|
"The number of objects stored in each slab.",
|
|
c.labels, nil)
|
|
|
|
return prometheus.MustNewConstMetric(
|
|
desc, prometheus.GaugeValue, float64(val), label,
|
|
)
|
|
}
|
|
|
|
func (c *slabinfoCollector) pagesPerSlab(label string, val int64) prometheus.Metric {
|
|
desc := prometheus.NewDesc(
|
|
prometheus.BuildFQName(namespace, c.subsystem, "pages_per_slab"),
|
|
"The number of pages allocated for each slab.",
|
|
c.labels, nil)
|
|
|
|
return prometheus.MustNewConstMetric(
|
|
desc, prometheus.GaugeValue, float64(val), label,
|
|
)
|
|
}
|