Add collector for Linux EDAC

Collect "Error detection and correction" metrics from memory
controllers.
* Supported on Linux only.
* Add basic fixtures.
* Enabled by default.

README.md

@@ -21,6 +21,7 @@ Name     | Description | OS
 conntrack | Shows conntrack statistics (does nothing if no `/proc/sys/net/netfilter/` present). | Linux
 cpu | Exposes CPU statistics | Darwin, Dragonfly, FreeBSD
 diskstats | Exposes disk I/O statistics from `/proc/diskstats`. | Linux
+edac | Exposes error detection and correction statistics. | Linux
 entropy | Exposes available entropy. | Linux
 filefd | Exposes file descriptor statistics from `/proc/sys/fs/file-nr`. | Linux
 filesystem | Exposes filesystem statistics, such as disk space used. | Darwin, Dragonfly, FreeBSD, Linux, OpenBSD

collector/edac_linux.go

@@ -0,0 +1,151 @@
+// Copyright 2015 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 !noedac
+
+package collector
+
+import (
+	"fmt"
+	"path"
+	"path/filepath"
+	"regexp"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+const (
+	edacSubsystem = "edac"
+)
+
+var (
+	edacMemControllerRE = regexp.MustCompile(`.*devices/system/edac/mc/mc([0-9]*)`)
+	edacMemCsrowRE      = regexp.MustCompile(`.*devices/system/edac/mc/mc[0-9]*/csrow([0-9]*)`)
+)
+
+type edacMCMetric struct {
+	metricName    string
+	metricType    prometheus.ValueType
+	metricHelp    string
+	memController string
+	value         float64
+}
+
+type edacCollector struct {
+	ceCount      *prometheus.Desc
+	ueCount      *prometheus.Desc
+	csRowCECount *prometheus.Desc
+	csRowUECount *prometheus.Desc
+}
+
+func init() {
+	Factories["edac"] = NewEdacCollector
+}
+
+// Takes a prometheus registry and returns a new Collector exposing
+// edac stats.
+func NewEdacCollector() (Collector, error) {
+	return &edacCollector{
+		ceCount: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, edacSubsystem, "correctable_errors_total"),
+			"Total correctable memory errors.",
+			[]string{"controller"}, nil,
+		),
+		ueCount: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, edacSubsystem, "uncorrectable_errors_total"),
+			"Total uncorrectable memory errors.",
+			[]string{"controller"}, nil,
+		),
+		csRowCECount: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, edacSubsystem, "csrow_correctable_errors_total"),
+			"Total correctable memory errors for this csrow.",
+			[]string{"controller", "csrow"}, nil,
+		),
+		csRowUECount: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, edacSubsystem, "csrow_uncorrectable_errors_total"),
+			"Total uncorrectable memory errors for this csrow.",
+			[]string{"controller", "csrow"}, nil,
+		),
+	}, nil
+}
+
+func (c *edacCollector) Update(ch chan<- prometheus.Metric) (err error) {
+	memControllers, err := filepath.Glob(sysFilePath("devices/system/edac/mc/mc[0-9]*"))
+	if err != nil {
+		return err
+	}
+	for _, controller := range memControllers {
+		controllerMatch := edacMemControllerRE.FindStringSubmatch(controller)
+		if controllerMatch == nil {
+			return fmt.Errorf("controller string didn't match regexp: %s", controller)
+		}
+		controllerNumber := controllerMatch[1]
+
+		value, err := readUintFromFile(path.Join(controller, "ce_count"))
+		if err != nil {
+			return fmt.Errorf("couldn't get ce_count for controller %s: %s", controllerNumber, err)
+		}
+		ch <- prometheus.MustNewConstMetric(
+			c.ceCount, prometheus.CounterValue, float64(value), controllerNumber)
+
+		value, err = readUintFromFile(path.Join(controller, "ce_noinfo_count"))
+		if err != nil {
+			return fmt.Errorf("couldn't get ce_noinfo_count for controller %s: %s", controllerNumber, err)
+		}
+		ch <- prometheus.MustNewConstMetric(
+			c.csRowCECount, prometheus.CounterValue, float64(value), controllerNumber, "unknown")
+
+		value, err = readUintFromFile(path.Join(controller, "ue_count"))
+		if err != nil {
+			return fmt.Errorf("couldn't get ue_count for controller %s: %s", controllerNumber, err)
+		}
+		ch <- prometheus.MustNewConstMetric(
+			c.ueCount, prometheus.CounterValue, float64(value), controllerNumber)
+
+		value, err = readUintFromFile(path.Join(controller, "ue_noinfo_count"))
+		if err != nil {
+			return fmt.Errorf("couldn't get ue_noinfo_count for controller %s: %s", controllerNumber, err)
+		}
+		ch <- prometheus.MustNewConstMetric(
+			c.csRowUECount, prometheus.CounterValue, float64(value), controllerNumber, "uknown")
+
+		// For each controller, walk the csrow directories.
+		csrows, err := filepath.Glob(controller + "/csrow[0-9]*")
+		if err != nil {
+			return err
+		}
+		for _, csrow := range csrows {
+			csrowMatch := edacMemCsrowRE.FindStringSubmatch(csrow)
+			if csrowMatch == nil {
+				return fmt.Errorf("csrow string didn't match regexp: %s", csrow)
+			}
+			csrowNumber := csrowMatch[1]
+
+			value, err = readUintFromFile(path.Join(csrow, "ce_count"))
+			if err != nil {
+				return fmt.Errorf("couldn't get ce_count for controller/csrow %s/%s: %s", controllerNumber, csrowNumber, err)
+			}
+			ch <- prometheus.MustNewConstMetric(
+				c.csRowCECount, prometheus.CounterValue, float64(value), controllerNumber, csrowNumber)
+
+			value, err = readUintFromFile(path.Join(csrow, "ue_count"))
+			if err != nil {
+				return fmt.Errorf("couldn't get ue_count for controller/csrow %s/%s: %s", controllerNumber, csrowNumber, err)
+			}
+			ch <- prometheus.MustNewConstMetric(
+				c.csRowUECount, prometheus.CounterValue, float64(value), controllerNumber, csrowNumber)
+		}
+	}
+
+	return err
+}

collector/fixtures/sys/devices/system/edac/mc/mc0/ce_count

@@ -0,0 +1 @@
+1

collector/fixtures/sys/devices/system/edac/mc/mc0/ce_noinfo_count

@@ -0,0 +1 @@
+2

collector/fixtures/sys/devices/system/edac/mc/mc0/csrow0/ce_count

@@ -0,0 +1 @@
+3

collector/fixtures/sys/devices/system/edac/mc/mc0/csrow0/ue_count

@@ -0,0 +1 @@
+4

collector/fixtures/sys/devices/system/edac/mc/mc0/ue_count

@@ -0,0 +1 @@
+5

collector/fixtures/sys/devices/system/edac/mc/mc0/ue_noinfo_count

@@ -0,0 +1 @@
+6

node_exporter.go

@@ -32,7 +32,7 @@ import (
 )
 
 const (
-	defaultCollectors = "conntrack,cpu,diskstats,entropy,filefd,filesystem,hwmon,loadavg,mdadm,meminfo,netdev,netstat,sockstat,stat,textfile,time,uname,vmstat,zfs"
+	defaultCollectors = "conntrack,cpu,diskstats,entropy,edac,filefd,filesystem,hwmon,loadavg,mdadm,meminfo,netdev,netstat,sockstat,stat,textfile,time,uname,vmstat,zfs"
 )
 
 var (