Add Btrfs collector (#1512)

* Add procfs/btrfs to vendor folder
* Add Btrfs collector

Resolves #1100

Signed-off-by: Silke Hofstra <silke@slxh.eu>
This commit is contained in:
Silke Hofstra 2020-02-19 15:48:51 +01:00 committed by GitHub
commit 8faa843fc4
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GPG key ID: 4AEE18F83AFDEB23
9 changed files with 1272 additions and 0 deletions

189
collector/btrfs_linux.go Normal file
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// Copyright 2019 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 !nobtrfs
package collector
import (
"fmt"
"github.com/go-kit/kit/log"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/procfs/btrfs"
)
// A btrfsCollector is a Collector which gathers metrics from Btrfs filesystems.
type btrfsCollector struct {
fs btrfs.FS
logger log.Logger
}
func init() {
registerCollector("btrfs", defaultEnabled, NewBtrfsCollector)
}
// NewBtrfsCollector returns a new Collector exposing Btrfs statistics.
func NewBtrfsCollector(logger log.Logger) (Collector, error) {
fs, err := btrfs.NewFS(*sysPath)
if err != nil {
return nil, fmt.Errorf("failed to open sysfs: %v", err)
}
return &btrfsCollector{
fs: fs,
logger: logger,
}, nil
}
// Update retrieves and exports Btrfs statistics.
// It implements Collector.
func (c *btrfsCollector) Update(ch chan<- prometheus.Metric) error {
stats, err := c.fs.Stats()
if err != nil {
return fmt.Errorf("failed to retrieve Btrfs stats: %v", err)
}
for _, s := range stats {
c.updateBtrfsStats(ch, s)
}
return nil
}
// btrfsMetric represents a single Btrfs metric that is converted into a Prometheus Metric.
type btrfsMetric struct {
name string
desc string
value float64
extraLabel []string
extraLabelValue []string
}
// updateBtrfsStats collects statistics for one bcache ID.
func (c *btrfsCollector) updateBtrfsStats(ch chan<- prometheus.Metric, s *btrfs.Stats) {
const subsystem = "btrfs"
// Basic information about the filesystem.
devLabels := []string{"uuid"}
// Retrieve the metrics.
metrics := c.getMetrics(s)
// Convert all gathered metrics to Prometheus Metrics and add to channel.
for _, m := range metrics {
labels := append(devLabels, m.extraLabel...)
desc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, m.name),
m.desc,
labels,
nil,
)
labelValues := []string{s.UUID}
if len(m.extraLabelValue) > 0 {
labelValues = append(labelValues, m.extraLabelValue...)
}
ch <- prometheus.MustNewConstMetric(
desc,
prometheus.GaugeValue,
m.value,
labelValues...,
)
}
}
// getMetrics returns metrics for the given Btrfs statistics.
func (c *btrfsCollector) getMetrics(s *btrfs.Stats) []btrfsMetric {
metrics := []btrfsMetric{
{
name: "info",
desc: "Filesystem information",
value: 1,
extraLabel: []string{"label"},
extraLabelValue: []string{s.Label},
},
{
name: "global_rsv_size_bytes",
desc: "Size of global reserve.",
value: float64(s.Allocation.GlobalRsvSize),
},
}
// Information about devices.
for n, dev := range s.Devices {
metrics = append(metrics, btrfsMetric{
name: "device_size_bytes",
desc: "Size of a device that is part of the filesystem.",
value: float64(dev.Size),
extraLabel: []string{"device"},
extraLabelValue: []string{n},
})
}
// Information about data, metadata and system data.
metrics = append(metrics, c.getAllocationStats("data", s.Allocation.Data)...)
metrics = append(metrics, c.getAllocationStats("metadata", s.Allocation.Metadata)...)
metrics = append(metrics, c.getAllocationStats("system", s.Allocation.System)...)
return metrics
}
// getAllocationStats returns allocation metrics for the given Btrfs Allocation statistics.
func (c *btrfsCollector) getAllocationStats(a string, s *btrfs.AllocationStats) []btrfsMetric {
metrics := []btrfsMetric{
{
name: "reserved_bytes",
desc: "Amount of space reserved for a data type",
value: float64(s.ReservedBytes),
extraLabel: []string{"block_group_type"},
extraLabelValue: []string{a},
},
}
// Add all layout statistics.
for layout, stats := range s.Layouts {
metrics = append(metrics, c.getLayoutStats(a, layout, stats)...)
}
return metrics
}
// getLayoutStats returns metrics for a data layout.
func (c *btrfsCollector) getLayoutStats(a, l string, s *btrfs.LayoutUsage) []btrfsMetric {
return []btrfsMetric{
{
name: "used_bytes",
desc: "Amount of used space by a layout/data type",
value: float64(s.UsedBytes),
extraLabel: []string{"block_group_type", "mode"},
extraLabelValue: []string{a, l},
},
{
name: "size_bytes",
desc: "Amount of space allocated for a layout/data type",
value: float64(s.TotalBytes),
extraLabel: []string{"block_group_type", "mode"},
extraLabelValue: []string{a, l},
},
{
name: "allocation_ratio",
desc: "Data allocation ratio for a layout/data type",
value: s.Ratio,
extraLabel: []string{"block_group_type", "mode"},
extraLabelValue: []string{a, l},
},
}
}

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// Copyright 2019 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 !nobtrfs
package collector
import (
"strings"
"testing"
"github.com/prometheus/procfs/btrfs"
)
var expectedBtrfsMetrics = [][]btrfsMetric{
{
{name: "info", value: 1, extraLabel: []string{"label"}, extraLabelValue: []string{"fixture"}},
{name: "global_rsv_size_bytes", value: 1.6777216e+07},
{name: "device_size_bytes", value: 1.073741824e+10, extraLabel: []string{"device"}, extraLabelValue: []string{"loop25"}},
{name: "device_size_bytes", value: 1.073741824e+10, extraLabel: []string{"device"}, extraLabelValue: []string{"loop26"}},
{name: "reserved_bytes", value: 0, extraLabel: []string{"block_group_type"}, extraLabelValue: []string{"data"}},
{name: "used_bytes", value: 8.08189952e+08, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"data", "raid0"}},
{name: "size_bytes", value: 2.147483648e+09, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"data", "raid0"}},
{name: "allocation_ratio", value: 1, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"data", "raid0"}},
{name: "reserved_bytes", value: 0, extraLabel: []string{"block_group_type"}, extraLabelValue: []string{"metadata"}},
{name: "used_bytes", value: 933888, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"metadata", "raid1"}},
{name: "size_bytes", value: 1.073741824e+09, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"metadata", "raid1"}},
{name: "allocation_ratio", value: 2, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"metadata", "raid1"}},
{name: "reserved_bytes", value: 0, extraLabel: []string{"block_group_type"}, extraLabelValue: []string{"system"}},
{name: "used_bytes", value: 16384, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"system", "raid1"}},
{name: "size_bytes", value: 8.388608e+06, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"system", "raid1"}},
{name: "allocation_ratio", value: 2, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"system", "raid1"}},
},
{
{name: "info", value: 1, extraLabel: []string{"label"}, extraLabelValue: []string{""}},
{name: "global_rsv_size_bytes", value: 1.6777216e+07},
{name: "device_size_bytes", value: 1.073741824e+10, extraLabel: []string{"device"}, extraLabelValue: []string{"loop22"}},
{name: "device_size_bytes", value: 1.073741824e+10, extraLabel: []string{"device"}, extraLabelValue: []string{"loop23"}},
{name: "device_size_bytes", value: 1.073741824e+10, extraLabel: []string{"device"}, extraLabelValue: []string{"loop24"}},
{name: "device_size_bytes", value: 1.073741824e+10, extraLabel: []string{"device"}, extraLabelValue: []string{"loop25"}},
{name: "reserved_bytes", value: 0, extraLabel: []string{"block_group_type"}, extraLabelValue: []string{"data"}},
{name: "used_bytes", value: 0, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"data", "raid5"}},
{name: "size_bytes", value: 6.44087808e+08, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"data", "raid5"}},
{name: "allocation_ratio", value: 1.3333333333333333, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"data", "raid5"}},
{name: "reserved_bytes", value: 0, extraLabel: []string{"block_group_type"}, extraLabelValue: []string{"metadata"}},
{name: "used_bytes", value: 114688, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"metadata", "raid6"}},
{name: "size_bytes", value: 4.29391872e+08, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"metadata", "raid6"}},
{name: "allocation_ratio", value: 2, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"metadata", "raid6"}},
{name: "reserved_bytes", value: 0, extraLabel: []string{"block_group_type"}, extraLabelValue: []string{"system"}},
{name: "used_bytes", value: 16384, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"system", "raid6"}},
{name: "size_bytes", value: 1.6777216e+07, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"system", "raid6"}},
{name: "allocation_ratio", value: 2, extraLabel: []string{"block_group_type", "mode"}, extraLabelValue: []string{"system", "raid6"}},
},
}
func checkMetric(exp, got *btrfsMetric) bool {
if exp.name != got.name ||
exp.value != got.value ||
len(exp.extraLabel) != len(got.extraLabel) ||
len(exp.extraLabelValue) != len(got.extraLabelValue) {
return false
}
for i := range exp.extraLabel {
if exp.extraLabel[i] != got.extraLabel[i] {
return false
}
// Devices (loopXX) can appear in random order, so just check the first 4 characters.
if strings.HasPrefix(got.extraLabelValue[i], "loop") &&
exp.extraLabelValue[i][:4] == got.extraLabelValue[i][:4] {
continue
}
if exp.extraLabelValue[i] != got.extraLabelValue[i] {
return false
}
}
return true
}
func TestBtrfs(t *testing.T) {
fs, _ := btrfs.NewFS("fixtures/sys")
collector := &btrfsCollector{fs: fs}
stats, err := collector.fs.Stats()
if err != nil {
t.Fatalf("Failed to retrieve Btrfs stats: %v", err)
}
if len(stats) != len(expectedBtrfsMetrics) {
t.Fatalf("Unexpected number of Btrfs stats: expected %v, got %v", len(expectedBtrfsMetrics), len(stats))
}
for i, s := range stats {
metrics := collector.getMetrics(s)
if len(metrics) != len(expectedBtrfsMetrics[i]) {
t.Fatalf("Unexpected number of Btrfs metrics: expected %v, got %v", len(expectedBtrfsMetrics[i]), len(metrics))
}
for j, m := range metrics {
exp := expectedBtrfsMetrics[i][j]
if !checkMetric(&exp, &m) {
t.Errorf("Incorrect btrfs metric: expected %#v, got: %#v", exp, m)
}
}
}
}

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@ -140,6 +140,54 @@ node_bonding_slaves{master="int"} 2
# HELP node_boot_time_seconds Node boot time, in unixtime.
# TYPE node_boot_time_seconds gauge
node_boot_time_seconds 1.418183276e+09
# HELP node_btrfs_allocation_ratio Data allocation ratio for a layout/data type
# TYPE node_btrfs_allocation_ratio gauge
node_btrfs_allocation_ratio{block_group_type="data",mode="raid0",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 1
node_btrfs_allocation_ratio{block_group_type="data",mode="raid5",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 1.3333333333333333
node_btrfs_allocation_ratio{block_group_type="metadata",mode="raid1",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 2
node_btrfs_allocation_ratio{block_group_type="metadata",mode="raid6",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 2
node_btrfs_allocation_ratio{block_group_type="system",mode="raid1",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 2
node_btrfs_allocation_ratio{block_group_type="system",mode="raid6",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 2
# HELP node_btrfs_device_size_bytes Size of a device that is part of the filesystem.
# TYPE node_btrfs_device_size_bytes gauge
node_btrfs_device_size_bytes{device="loop22",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 1.073741824e+10
node_btrfs_device_size_bytes{device="loop23",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 1.073741824e+10
node_btrfs_device_size_bytes{device="loop24",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 1.073741824e+10
node_btrfs_device_size_bytes{device="loop25",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 1.073741824e+10
node_btrfs_device_size_bytes{device="loop25",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 1.073741824e+10
node_btrfs_device_size_bytes{device="loop26",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 1.073741824e+10
# HELP node_btrfs_global_rsv_size_bytes Size of global reserve.
# TYPE node_btrfs_global_rsv_size_bytes gauge
node_btrfs_global_rsv_size_bytes{uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 1.6777216e+07
node_btrfs_global_rsv_size_bytes{uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 1.6777216e+07
# HELP node_btrfs_info Filesystem information
# TYPE node_btrfs_info gauge
node_btrfs_info{label="",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 1
node_btrfs_info{label="fixture",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 1
# HELP node_btrfs_reserved_bytes Amount of space reserved for a data type
# TYPE node_btrfs_reserved_bytes gauge
node_btrfs_reserved_bytes{block_group_type="data",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 0
node_btrfs_reserved_bytes{block_group_type="data",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 0
node_btrfs_reserved_bytes{block_group_type="metadata",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 0
node_btrfs_reserved_bytes{block_group_type="metadata",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 0
node_btrfs_reserved_bytes{block_group_type="system",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 0
node_btrfs_reserved_bytes{block_group_type="system",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 0
# HELP node_btrfs_size_bytes Amount of space allocated for a layout/data type
# TYPE node_btrfs_size_bytes gauge
node_btrfs_size_bytes{block_group_type="data",mode="raid0",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 2.147483648e+09
node_btrfs_size_bytes{block_group_type="data",mode="raid5",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 6.44087808e+08
node_btrfs_size_bytes{block_group_type="metadata",mode="raid1",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 1.073741824e+09
node_btrfs_size_bytes{block_group_type="metadata",mode="raid6",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 4.29391872e+08
node_btrfs_size_bytes{block_group_type="system",mode="raid1",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 8.388608e+06
node_btrfs_size_bytes{block_group_type="system",mode="raid6",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 1.6777216e+07
# HELP node_btrfs_used_bytes Amount of used space by a layout/data type
# TYPE node_btrfs_used_bytes gauge
node_btrfs_used_bytes{block_group_type="data",mode="raid0",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 8.08189952e+08
node_btrfs_used_bytes{block_group_type="data",mode="raid5",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 0
node_btrfs_used_bytes{block_group_type="metadata",mode="raid1",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 933888
node_btrfs_used_bytes{block_group_type="metadata",mode="raid6",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 114688
node_btrfs_used_bytes{block_group_type="system",mode="raid1",uuid="0abb23a9-579b-43e6-ad30-227ef47fcb9d"} 16384
node_btrfs_used_bytes{block_group_type="system",mode="raid6",uuid="7f07c59f-6136-449c-ab87-e1cf2328731b"} 16384
# HELP node_buddyinfo_blocks Count of free blocks according to size.
# TYPE node_buddyinfo_blocks gauge
node_buddyinfo_blocks{node="0",size="0",zone="DMA"} 1
@ -2560,6 +2608,7 @@ node_schedstat_waiting_seconds_total{cpu="1"} 364107.263788241
node_scrape_collector_success{collector="arp"} 1
node_scrape_collector_success{collector="bcache"} 1
node_scrape_collector_success{collector="bonding"} 1
node_scrape_collector_success{collector="btrfs"} 1
node_scrape_collector_success{collector="buddyinfo"} 1
node_scrape_collector_success{collector="conntrack"} 1
node_scrape_collector_success{collector="cpu"} 1

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