collector/netisr_freebsd.go: Added collector for netisr subsystem.

Signed-off-by: Jonathan Davies <jpds@protonmail.com>

README.md

@@ -107,6 +107,7 @@ mdadm | Exposes statistics about devices in `/proc/mdstat` (does nothing if no `
 meminfo | Exposes memory statistics. | Darwin, Dragonfly, FreeBSD, Linux, OpenBSD
 netclass | Exposes network interface info from `/sys/class/net/` | Linux
 netdev | Exposes network interface statistics such as bytes transferred. | Darwin, Dragonfly, FreeBSD, Linux, OpenBSD
+netisr | Exposes netisr statistics | FreeBSD
 netstat | Exposes network statistics from `/proc/net/netstat`. This is the same information as `netstat -s`. | Linux
 nfs | Exposes NFS client statistics from `/proc/net/rpc/nfs`. This is the same information as `nfsstat -c`. | Linux
 nfsd | Exposes NFS kernel server statistics from `/proc/net/rpc/nfsd`. This is the same information as `nfsstat -s`. | Linux

collector/netisr_freebsd.go

@@ -0,0 +1,105 @@
+// Copyright 2023 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 freebsd && !nonetisr
+// +build freebsd,!nonetisr
+
+package collector
+
+import (
+	"fmt"
+
+	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+type netisrCollector struct {
+	sysctls []bsdSysctl
+	logger  log.Logger
+}
+
+const (
+	netisrCollectorSubsystem = "netisr"
+)
+
+func init() {
+	registerCollector("netisr", defaultEnabled, NewNetisrCollector)
+}
+
+func NewNetisrCollector(logger log.Logger) (Collector, error) {
+	return &netisrCollector{
+		sysctls: []bsdSysctl{
+			{
+				name:        "numthreads",
+				description: "netisr current thread count",
+				mib:         "net.isr.numthreads",
+				dataType:    bsdSysctlTypeUint32,
+				valueType:   prometheus.GaugeValue,
+			},
+			{
+				name:        "maxprot",
+				description: "netisr maximum protocols",
+				mib:         "net.isr.maxprot",
+				dataType:    bsdSysctlTypeUint32,
+				valueType:   prometheus.GaugeValue,
+			},
+			{
+				name:        "defaultqlimit",
+				description: "netisr default queue limit",
+				mib:         "net.isr.defaultqlimit",
+				dataType:    bsdSysctlTypeUint32,
+				valueType:   prometheus.GaugeValue,
+			},
+			{
+				name:        "maxqlimit",
+				description: "netisr maximum queue limit",
+				mib:         "net.isr.maxqlimit",
+				dataType:    bsdSysctlTypeUint32,
+				valueType:   prometheus.GaugeValue,
+			},
+			{
+				name:        "bindthreads",
+				description: "netisr bound to CPUs",
+				mib:         "net.isr.bindthreads",
+				dataType:    bsdSysctlTypeUint32,
+				valueType:   prometheus.GaugeValue,
+			},
+			{
+				name:        "maxthreads",
+				description: "netisr maximum thread count",
+				mib:         "net.isr.maxthreads",
+				dataType:    bsdSysctlTypeUint32,
+				valueType:   prometheus.GaugeValue,
+			},
+		},
+		logger: logger,
+	}, nil
+}
+
+func (c *netisrCollector) Update(ch chan<- prometheus.Metric) error {
+	for _, m := range c.sysctls {
+		v, err := m.Value()
+		if err != nil {
+			return fmt.Errorf("couldn't get sysctl: %w", err)
+		}
+
+		ch <- prometheus.MustNewConstMetric(
+			prometheus.NewDesc(
+				prometheus.BuildFQName(namespace, netisrCollectorSubsystem, m.name),
+				m.description,
+				nil, nil,
+			), m.valueType, v)
+	}
+
+	return nil
+}