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// Copyright 2017 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.
package collector
import (
"fmt"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/procfs/sysfs"
"github.com/prometheus/procfs/xfs"
)
// An xfsCollector is a Collector which gathers metrics from XFS filesystems.
type xfsCollector struct {
fs sysfs.FS
}
func init() {
registerCollector("xfs", defaultEnabled, NewXFSCollector)
}
// NewXFSCollector returns a new Collector exposing XFS statistics.
func NewXFSCollector() (Collector, error) {
fs, err := sysfs.NewFS(*sysPath)
if err != nil {
return nil, fmt.Errorf("failed to open sysfs: %v", err)
}
return &xfsCollector{
fs: fs,
}, nil
}
// Update implements Collector.
func (c *xfsCollector) Update(ch chan<- prometheus.Metric) error {
stats, err := c.fs.XFSStats()
if err != nil {
return fmt.Errorf("failed to retrieve XFS stats: %v", err)
}
for _, s := range stats {
c.updateXFSStats(ch, s)
}
return nil
}
// updateXFSStats collects statistics for a single XFS filesystem.
func (c *xfsCollector) updateXFSStats(ch chan<- prometheus.Metric, s *xfs.Stats) {
const (
subsystem = "xfs"
)
var (
labels = []string{"device"}
)
// Metric names and descriptions are sourced from:
// http://xfs.org/index.php/Runtime_Stats.
//
// Each metric has a name that roughly follows the pattern of
// "node_xfs_category_value_total", using the categories and value names
// found on the XFS wiki.
//
// Note that statistics for more than one internal B-tree are measured,
// and as such, each one must be differentiated by name.
metrics := []struct {
name string
desc string
value float64
}{
{
name: "extent_allocation_extents_allocated_total",
desc: "Number of extents allocated for a filesystem.",
value: float64(s.ExtentAllocation.ExtentsAllocated),
},
{
name: "extent_allocation_blocks_allocated_total",
desc: "Number of blocks allocated for a filesystem.",
value: float64(s.ExtentAllocation.BlocksAllocated),
},
{
name: "extent_allocation_extents_freed_total",
desc: "Number of extents freed for a filesystem.",
value: float64(s.ExtentAllocation.ExtentsFreed),
},
{
name: "extent_allocation_blocks_freed_total",
desc: "Number of blocks freed for a filesystem.",
value: float64(s.ExtentAllocation.BlocksFreed),
},
{
name: "allocation_btree_lookups_total",
desc: "Number of allocation B-tree lookups for a filesystem.",
value: float64(s.AllocationBTree.Lookups),
},
{
name: "allocation_btree_compares_total",
desc: "Number of allocation B-tree compares for a filesystem.",
value: float64(s.AllocationBTree.Compares),
},
{
name: "allocation_btree_records_inserted_total",
desc: "Number of allocation B-tree records inserted for a filesystem.",
value: float64(s.AllocationBTree.RecordsInserted),
},
{
name: "allocation_btree_records_deleted_total",
desc: "Number of allocation B-tree records deleted for a filesystem.",
value: float64(s.AllocationBTree.RecordsDeleted),
},
{
name: "block_mapping_reads_total",
desc: "Number of block map for read operations for a filesystem.",
value: float64(s.BlockMapping.Reads),
},
{
name: "block_mapping_writes_total",
desc: "Number of block map for write operations for a filesystem.",
value: float64(s.BlockMapping.Writes),
},
{
name: "block_mapping_unmaps_total",
desc: "Number of block unmaps (deletes) for a filesystem.",
value: float64(s.BlockMapping.Unmaps),
},
{
name: "block_mapping_extent_list_insertions_total",
desc: "Number of extent list insertions for a filesystem.",
value: float64(s.BlockMapping.ExtentListInsertions),
},
{
name: "block_mapping_extent_list_deletions_total",
desc: "Number of extent list deletions for a filesystem.",
value: float64(s.BlockMapping.ExtentListDeletions),
},
{
name: "block_mapping_extent_list_lookups_total",
desc: "Number of extent list lookups for a filesystem.",
value: float64(s.BlockMapping.ExtentListLookups),
},
{
name: "block_mapping_extent_list_compares_total",
desc: "Number of extent list compares for a filesystem.",
value: float64(s.BlockMapping.ExtentListCompares),
},
{
name: "block_map_btree_lookups_total",
desc: "Number of block map B-tree lookups for a filesystem.",
value: float64(s.BlockMapBTree.Lookups),
},
{
name: "block_map_btree_compares_total",
desc: "Number of block map B-tree compares for a filesystem.",
value: float64(s.BlockMapBTree.Compares),
},
{
name: "block_map_btree_records_inserted_total",
desc: "Number of block map B-tree records inserted for a filesystem.",
value: float64(s.BlockMapBTree.RecordsInserted),
},
{
name: "block_map_btree_records_deleted_total",
desc: "Number of block map B-tree records deleted for a filesystem.",
value: float64(s.BlockMapBTree.RecordsDeleted),
},
}
for _, m := range metrics {
desc := prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, m.name),
m.desc,
labels,
nil,
)
ch <- prometheus.MustNewConstMetric(
desc,
prometheus.CounterValue,
m.value,
s.Name,
)
}
}
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