Add AIX diskstats

Signed-off-by: Johannes Ziemke <github@5pi.de>

collector/diskstats_aix.go

@@ -0,0 +1,82 @@
+// Copyright 2024 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 !nodiskstats
+// +build !nodiskstats
+
+package collector
+
+import (
+	"fmt"
+	"log/slog"
+
+	"github.com/power-devops/perfstat"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+const diskstatsDefaultIgnoredDevices = ""
+
+type diskstatsCollector struct {
+	rbytes typedDesc
+	wbytes typedDesc
+	time   typedDesc
+
+	deviceFilter deviceFilter
+	logger       *slog.Logger
+
+	tickPerSecond int64
+}
+
+func init() {
+	registerCollector("diskstats", defaultEnabled, NewDiskstatsCollector)
+}
+
+// NewDiskstatsCollector returns a new Collector exposing disk device stats.
+func NewDiskstatsCollector(logger *slog.Logger) (Collector, error) {
+	ticks, err := tickPerSecond()
+	if err != nil {
+		return nil, err
+	}
+	deviceFilter, err := newDiskstatsDeviceFilter(logger)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse device filter flags: %w", err)
+	}
+
+	return &diskstatsCollector{
+		rbytes: typedDesc{readBytesDesc, prometheus.CounterValue},
+		wbytes: typedDesc{writtenBytesDesc, prometheus.CounterValue},
+		time:   typedDesc{ioTimeSecondsDesc, prometheus.CounterValue},
+
+		deviceFilter: deviceFilter,
+		logger:       logger,
+
+		tickPerSecond: ticks,
+	}, nil
+}
+
+func (c *diskstatsCollector) Update(ch chan<- prometheus.Metric) error {
+	stats, err := perfstat.DiskStat()
+	if err != nil {
+		return err
+	}
+
+	for _, stat := range stats {
+		if c.deviceFilter.ignored(stat.Name) {
+			continue
+		}
+		ch <- c.rbytes.mustNewConstMetric(float64(stat.Rblks*512), stat.Name)
+		ch <- c.wbytes.mustNewConstMetric(float64(stat.Wblks*512), stat.Name)
+		ch <- c.time.mustNewConstMetric(float64(stat.Time/c.tickPerSecond), stat.Name)
+	}
+	return nil
+}

collector/diskstats_common.go

@@ -11,9 +11,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build !nodiskstats && (openbsd || linux || darwin)
+//go:build !nodiskstats && (openbsd || linux || darwin || aix)
 // +build !nodiskstats
-// +build openbsd linux darwin
+// +build openbsd linux darwin aix
 
 package collector