Merge pull request #372 from callvirtual/features/sql-transactions-collector

Add support for MSSQL Transactions counters

.gitignore

@@ -3,3 +3,5 @@ VERSION
 *.swp
 *.un~
 output/
+.vscode
+.idea

README.md

@@ -12,6 +12,7 @@ Name     | Description | Enabled by default
 [ad](docs/collector.ad.md) | Active Directory Domain Services |
 [cpu](docs/collector.cpu.md) | CPU usage | ✓
 [cs](docs/collector.cs.md) | "Computer System" metrics (system properties, num cpus/total memory) | ✓
+[container](docs/collector.container.md) | Container metrics |
 [dns](docs/collector.dns.md) | DNS Server |
 [hyperv](docs/collector.hyperv.md) | Hyper-V hosts |
 [iis](docs/collector.iis.md) | IIS sites and applications |
@@ -33,6 +34,7 @@ Name     | Description | Enabled by default
 [service](docs/collector.service.md) | Service state metrics | ✓
 [system](docs/collector.system.md) | System calls | ✓
 [tcp](docs/collector.tcp.md) | TCP connections |
+[thermalzone](docs/collector.thermalzone.md) | Thermal information
 [textfile](docs/collector.textfile.md) | Read prometheus metrics from a text file | ✓
 [vmware](docs/collector.vmware.md) | Performance counters installed by the Vmware Guest agent |
 

appveyor.yml

@@ -40,12 +40,13 @@ after_build:
         return
       }
       $ErrorActionPreference = "Stop"
+      $BuildVersion = Get-Content VERSION
       # The MSI version is not semver compliant, so just take the numerical parts
-      $Version = $env:APPVEYOR_REPO_TAG_NAME -replace '^v?([0-9\.]+).*$','$1'
+      $MSIVersion = $env:APPVEYOR_REPO_TAG_NAME -replace '^v?([0-9\.]+).*$','$1'
       foreach($Arch in "amd64","386") {
-        Write-Verbose "Building wmi_exporter $Version msi for $Arch"
+        Write-Verbose "Building wmi_exporter $MSIVersion msi for $Arch"
-        .\installer\build.ps1 -PathToExecutable .\output\$Arch\wmi_exporter-$Version-$Arch.exe -Version $Version -Arch "$Arch"
+        .\installer\build.ps1 -PathToExecutable .\output\$Arch\wmi_exporter-$BuildVersion-$Arch.exe -Version $MSIVersion -Arch "$Arch"
-        Move-Item installer\Output\wmi_exporter-$Version-$Arch.msi output\$Arch\
+        Move-Item installer\Output\wmi_exporter-$MSIVersion-$Arch.msi output\$Arch\
       }
   - promu checksum output\
 

collector/collector.go

@@ -1,8 +1,12 @@
 package collector
 
 import (
+	"strconv"
+
 	"github.com/leoluk/perflib_exporter/perflib"
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/common/log"
+	"golang.org/x/sys/windows/registry"
 )
 
 // ...
@@ -15,6 +19,34 @@ const (
 	windowsEpoch              = 116444736000000000
 )
 
+// getWindowsVersion reads the version number of the OS from the Registry
+// See https://docs.microsoft.com/en-us/windows/desktop/sysinfo/operating-system-version
+func getWindowsVersion() float64 {
+	k, err := registry.OpenKey(registry.LOCAL_MACHINE, `SOFTWARE\Microsoft\Windows NT\CurrentVersion`, registry.QUERY_VALUE)
+	if err != nil {
+		log.Warn("Couldn't open registry", err)
+		return 0
+	}
+	defer func() {
+		err = k.Close()
+		if err != nil {
+			log.Warnf("Failed to close registry key: %v", err)
+		}
+	}()
+
+	currentv, _, err := k.GetStringValue("CurrentVersion")
+	if err != nil {
+		log.Warn("Couldn't open registry to determine current Windows version:", err)
+		return 0
+	}
+
+	currentv_flt, err := strconv.ParseFloat(currentv, 64)
+
+	log.Debugf("Detected Windows version %f\n", currentv_flt)
+
+	return currentv_flt
+}
+
 // Factories ...
 var Factories = make(map[string]func() (Collector, error))
 

collector/cpu.go

@@ -3,46 +3,15 @@
 package collector
 
 import (
-	"strconv"
 	"strings"
 
-	"golang.org/x/sys/windows/registry"
-
 	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/common/log"
 )
 
 func init() {
 	Factories["cpu"] = newCPUCollector
 }
 
-// A function to get Windows version from registry
-func getWindowsVersion() float64 {
-	k, err := registry.OpenKey(registry.LOCAL_MACHINE, `SOFTWARE\Microsoft\Windows NT\CurrentVersion`, registry.QUERY_VALUE)
-	if err != nil {
-		log.Warn("Couldn't open registry", err)
-		return 0
-	}
-	defer func() {
-		err = k.Close()
-		if err != nil {
-			log.Warnf("Failed to close registry key: %v", err)
-		}
-	}()
-
-	currentv, _, err := k.GetStringValue("CurrentVersion")
-	if err != nil {
-		log.Warn("Couldn't open registry to determine current Windows version:", err)
-		return 0
-	}
-
-	currentv_flt, err := strconv.ParseFloat(currentv, 64)
-
-	log.Debugf("Detected Windows version %f\n", currentv_flt)
-
-	return currentv_flt
-}
-
 type cpuCollectorBasic struct {
 	CStateSecondsTotal *prometheus.Desc
 	TimeTotal          *prometheus.Desc
@@ -67,10 +36,12 @@ func newCPUCollector() (Collector, error) {
 	const subsystem = "cpu"
 
 	version := getWindowsVersion()
-	// Windows version by number https://docs.microsoft.com/en-us/windows/desktop/sysinfo/operating-system-version
+	// For Windows 2008 (version 6.0) or earlier we only have the "Processor"
-	// For Windows 2008 or earlier Windows version is 6.0 or lower, where we only have the older "Processor" counters
+	// class. As of Windows 2008 R2 (version 6.1) the more detailed
-	// For Windows 2008 R2 or later Windows version is 6.1 or higher, so we can use "ProcessorInformation" counters
+	// "ProcessorInformation" set is available (although some of the counters
-	// Value 6.05 was selected just to split between Windows versions
+	// are added in later versions, so we aren't guaranteed to get all of
+	// them).
+	// Value 6.05 was selected to split between Windows versions.
 	if version < 6.05 {
 		return &cpuCollectorBasic{
 			CStateSecondsTotal: prometheus.NewDesc(

collector/mssql.go

@@ -91,7 +91,7 @@ func mssqlBuildWMIInstanceClass(suffix string, instance string) string {
 type mssqlCollectorsMap map[string]mssqlCollectorFunc
 
 func mssqlAvailableClassCollectors() string {
-	return "accessmethods,availreplica,bufman,databases,dbreplica,genstats,locks,memmgr,sqlstats"
+	return "accessmethods,availreplica,bufman,databases,dbreplica,genstats,locks,memmgr,sqlstats,sqlerrors,transactions"
 }
 
 func (c *MSSQLCollector) getMSSQLCollectors() mssqlCollectorsMap {
@@ -105,6 +105,8 @@ func (c *MSSQLCollector) getMSSQLCollectors() mssqlCollectorsMap {
 	mssqlCollectors["locks"] = c.collectLocks
 	mssqlCollectors["memmgr"] = c.collectMemoryManager
 	mssqlCollectors["sqlstats"] = c.collectSQLStats
+	mssqlCollectors["sqlerrors"] = c.collectSQLErrors
+	mssqlCollectors["transactions"] = c.collectTransactions
 
 	return mssqlCollectors
 }
@@ -358,6 +360,24 @@ type MSSQLCollector struct {
 	SQLStatsSQLReCompilations       *prometheus.Desc
 	SQLStatsUnsafeAutoParams        *prometheus.Desc
 
+	// Win32_PerfRawData_{instance}_SQLServerSQLErrors
+	SQLErrorsTotal *prometheus.Desc
+
+	// Win32_PerfRawData_{instance}_SQLServerTransactions
+	TransactionsTempDbFreeSpaceBytes             *prometheus.Desc
+	TransactionsLongestTransactionRunningSeconds *prometheus.Desc
+	TransactionsNonSnapshotVersionActiveTotal    *prometheus.Desc
+	TransactionsSnapshotActiveTotal              *prometheus.Desc
+	TransactionsActiveTotal                      *prometheus.Desc
+	TransactionsUpdateConflictsTotal             *prometheus.Desc
+	TransactionsUpdateSnapshotActiveTotal        *prometheus.Desc
+	TransactionsVersionCleanupRateBytes          *prometheus.Desc
+	TransactionsVersionGenerationRateBytes       *prometheus.Desc
+	TransactionsVersionStoreSizeBytes            *prometheus.Desc
+	TransactionsVersionStoreUnits                *prometheus.Desc
+	TransactionsVersionStoreCreationUnits        *prometheus.Desc
+	TransactionsVersionStoreTruncationUnits      *prometheus.Desc
+
 	mssqlInstances             mssqlInstancesType
 	mssqlCollectors            mssqlCollectorsMap
 	mssqlChildCollectorFailure int
@@ -1637,6 +1657,94 @@ func NewMSSQLCollector() (Collector, error) {
 			nil,
 		),
 
+		// Win32_PerfRawData_{instance}_SQLServerSQLErrors
+		SQLErrorsTotal: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "sql_errors_total"),
+			"(SQLErrors.Total)",
+			[]string{"instance", "resource"},
+			nil,
+		),
+
+		// Win32_PerfRawData_{instance}_SQLServerTransactions
+		TransactionsTempDbFreeSpaceBytes: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "transactions_tempdb_free_space_bytes"),
+			"(Transactions.FreeSpaceInTempDbKB)",
+			[]string{"instance"},
+			nil,
+		),
+		TransactionsLongestTransactionRunningSeconds: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "transactions_longest_transaction_running_seconds"),
+			"(Transactions.LongestTransactionRunningTime)",
+			[]string{"instance"},
+			nil,
+		),
+		TransactionsNonSnapshotVersionActiveTotal: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "transactions_nonsnapshot_version_active_total"),
+			"(Transactions.NonSnapshotVersionTransactions)",
+			[]string{"instance"},
+			nil,
+		),
+		TransactionsSnapshotActiveTotal: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "transactions_snapshot_active_total"),
+			"(Transactions.SnapshotTransactions)",
+			[]string{"instance"},
+			nil,
+		),
+		TransactionsActiveTotal: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "transactions_active_total"),
+			"(Transactions.Transactions)",
+			[]string{"instance"},
+			nil,
+		),
+		TransactionsUpdateConflictsTotal: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "transactions_update_conflicts_total"),
+			"(Transactions.UpdateConflictRatio)",
+			[]string{"instance"},
+			nil,
+		),
+		TransactionsUpdateSnapshotActiveTotal: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "transactions_update_snapshot_active_total"),
+			"(Transactions.UpdateSnapshotTransactions)",
+			[]string{"instance"},
+			nil,
+		),
+		TransactionsVersionCleanupRateBytes: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "transactions_version_cleanup_rate_bytes"),
+			"(Transactions.VersionCleanupRateKBs)",
+			[]string{"instance"},
+			nil,
+		),
+		TransactionsVersionGenerationRateBytes: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "transactions_version_generation_rate_bytes"),
+			"(Transactions.VersionGenerationRateKBs)",
+			[]string{"instance"},
+			nil,
+		),
+		TransactionsVersionStoreSizeBytes: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "transactions_version_store_size_bytes"),
+			"(Transactions.VersionStoreSizeKB)",
+			[]string{"instance"},
+			nil,
+		),
+		TransactionsVersionStoreUnits: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "transactions_version_store_units"),
+			"(Transactions.VersionStoreUnitCount)",
+			[]string{"instance"},
+			nil,
+		),
+		TransactionsVersionStoreCreationUnits: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "transactions_version_store_creation_units"),
+			"(Transactions.VersionStoreUnitCreation)",
+			[]string{"instance"},
+			nil,
+		),
+		TransactionsVersionStoreTruncationUnits: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "transactions_version_store_truncation_units"),
+			"(Transactions.VersionStoreUnitTruncation)",
+			[]string{"instance"},
+			nil,
+		),
+
 		mssqlInstances: getMSSQLInstances(),
 	}
 
@@ -2575,7 +2683,7 @@ func (c *MSSQLCollector) collectDatabaseReplica(ch chan<- prometheus.Metric, sql
 		ch <- prometheus.MustNewConstMetric(
 			c.DBReplicaTransactionDelay,
 			prometheus.GaugeValue,
-			float64(v.TransactionDelay)*1000.0,
+			float64(v.TransactionDelay)/1000.0,
 			sqlInstance, replicaName,
 		)
 	}
@@ -3558,3 +3666,162 @@ func (c *MSSQLCollector) collectSQLStats(ch chan<- prometheus.Metric, sqlInstanc
 
 	return nil, nil
 }
+
+type win32PerfRawDataSQLServerSQLErrors struct {
+	Name         string
+	ErrorsPersec uint64
+}
+
+// Win32_PerfRawData_MSSQLSERVER_SQLServerErrors docs:
+// - https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-sql-errors-object
+func (c *MSSQLCollector) collectSQLErrors(ch chan<- prometheus.Metric, sqlInstance string) (*prometheus.Desc, error) {
+	var dst []win32PerfRawDataSQLServerSQLErrors
+	log.Debugf("mssql_sqlerrors collector iterating sql instance %s.", sqlInstance)
+
+	class := mssqlBuildWMIInstanceClass("SQLErrors", sqlInstance)
+	q := queryAllForClassWhere(&dst, class, `Name <> '_Total'`)
+	if err := wmi.Query(q, &dst); err != nil {
+		return nil, err
+	}
+
+	for _, v := range dst {
+		resource := v.Name
+
+		ch <- prometheus.MustNewConstMetric(
+			c.SQLErrorsTotal,
+			prometheus.CounterValue,
+			float64(v.ErrorsPersec),
+			sqlInstance, resource,
+		)
+	}
+
+	return nil, nil
+}
+
+type win32PerfRawDataSqlServerTransactions struct {
+	FreeSpaceintempdbKB            uint64
+	LongestTransactionRunningTime  uint64
+	NonSnapshotVersionTransactions uint64
+	SnapshotTransactions           uint64
+	Transactions                   uint64
+	Updateconflictratio            uint64
+	UpdateSnapshotTransactions     uint64
+	VersionCleanuprateKBPers       uint64
+	VersionGenerationrateKBPers    uint64
+	VersionStoreSizeKB             uint64
+	VersionStoreunitcount          uint64
+	VersionStoreunitcreation       uint64
+	VersionStoreunittruncation     uint64
+}
+
+// Win32_PerfRawData_MSSQLSERVER_Transactions docs:
+// - https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-transactions-object
+func (c *MSSQLCollector) collectTransactions(ch chan<- prometheus.Metric, sqlInstance string) (*prometheus.Desc, error) {
+	var dst []win32PerfRawDataSqlServerTransactions
+	log.Debugf("mssql_transactions collector iterating sql instance %s.", sqlInstance)
+
+	class := mssqlBuildWMIInstanceClass("Transactions", sqlInstance)
+	q := queryAllForClass(&dst, class)
+	if err := wmi.Query(q, &dst); err != nil {
+		return nil, err
+	}
+
+	if len(dst) == 0 {
+		return nil, errors.New("WMI query returned empty result set")
+	}
+
+	v := dst[0]
+
+	ch <- prometheus.MustNewConstMetric(
+		c.TransactionsTempDbFreeSpaceBytes,
+		prometheus.GaugeValue,
+		float64(v.FreeSpaceintempdbKB*1024),
+		sqlInstance,
+	)
+
+	ch <- prometheus.MustNewConstMetric(
+		c.TransactionsLongestTransactionRunningSeconds,
+		prometheus.GaugeValue,
+		float64(v.LongestTransactionRunningTime),
+		sqlInstance,
+	)
+
+	ch <- prometheus.MustNewConstMetric(
+		c.TransactionsNonSnapshotVersionActiveTotal,
+		prometheus.CounterValue,
+		float64(v.NonSnapshotVersionTransactions),
+		sqlInstance,
+	)
+
+	ch <- prometheus.MustNewConstMetric(
+		c.TransactionsSnapshotActiveTotal,
+		prometheus.CounterValue,
+		float64(v.SnapshotTransactions),
+		sqlInstance,
+	)
+
+	ch <- prometheus.MustNewConstMetric(
+		c.TransactionsActiveTotal,
+		prometheus.CounterValue,
+		float64(v.Transactions),
+		sqlInstance,
+	)
+
+	ch <- prometheus.MustNewConstMetric(
+		c.TransactionsUpdateConflictsTotal,
+		prometheus.CounterValue,
+		float64(v.Updateconflictratio),
+		sqlInstance,
+	)
+
+	ch <- prometheus.MustNewConstMetric(
+		c.TransactionsUpdateSnapshotActiveTotal,
+		prometheus.CounterValue,
+		float64(v.UpdateSnapshotTransactions),
+		sqlInstance,
+	)
+
+	ch <- prometheus.MustNewConstMetric(
+		c.TransactionsVersionCleanupRateBytes,
+		prometheus.GaugeValue,
+		float64(v.VersionCleanuprateKBPers*1024),
+		sqlInstance,
+	)
+
+	ch <- prometheus.MustNewConstMetric(
+		c.TransactionsVersionGenerationRateBytes,
+		prometheus.GaugeValue,
+		float64(v.VersionGenerationrateKBPers*1024),
+		sqlInstance,
+	)
+
+	ch <- prometheus.MustNewConstMetric(
+		c.TransactionsVersionStoreSizeBytes,
+		prometheus.GaugeValue,
+		float64(v.VersionStoreSizeKB*1024),
+		sqlInstance,
+	)
+
+	ch <- prometheus.MustNewConstMetric(
+		c.TransactionsVersionStoreUnits,
+		prometheus.CounterValue,
+		float64(v.VersionStoreunitcount),
+		sqlInstance,
+	)
+
+	ch <- prometheus.MustNewConstMetric(
+		c.TransactionsVersionStoreCreationUnits,
+		prometheus.CounterValue,
+		float64(v.VersionStoreunitcreation),
+		sqlInstance,
+	)
+
+	ch <- prometheus.MustNewConstMetric(
+		c.TransactionsVersionStoreTruncationUnits,
+		prometheus.CounterValue,
+		float64(v.VersionStoreunittruncation),
+		sqlInstance,
+	)
+
+	return nil, nil
+}

collector/perflib.go

@@ -63,11 +63,14 @@ func unmarshalObject(obj *perflib.PerfObject, vs interface{}) error {
 
 			ctr, found := counters[tag]
 			if !found {
-				log.Debugf("missing counter %q, has %v", tag, counters)
+				log.Debugf("missing counter %q, have %v", tag, counterMapKeys(counters))
-				return fmt.Errorf("could not find counter %q on instance", tag)
+				continue
 			}
 			if !target.Field(i).CanSet() {
-				return fmt.Errorf("tagged field %v cannot be written to", f)
+				return fmt.Errorf("tagged field %v cannot be written to", f.Name)
+			}
+			if fieldType := target.Field(i).Type(); fieldType != reflect.TypeOf((*float64)(nil)).Elem() {
+				return fmt.Errorf("tagged field %v has wrong type %v, must be float64", f.Name, fieldType)
 			}
 
 			switch ctr.Def.CounterType {
@@ -87,3 +90,11 @@ func unmarshalObject(obj *perflib.PerfObject, vs interface{}) error {
 
 	return nil
 }
+
+func counterMapKeys(m map[string]*perflib.PerfCounter) []string {
+	keys := make([]string, 0, len(m))
+	for k := range m {
+		keys = append(keys, k)
+	}
+	return keys
+}

collector/perflib_test.go

@@ -0,0 +1,125 @@
+package collector
+
+import (
+	"reflect"
+	"testing"
+
+	perflibCollector "github.com/leoluk/perflib_exporter/collector"
+	"github.com/leoluk/perflib_exporter/perflib"
+)
+
+type simple struct {
+	ValA float64 `perflib:"Something"`
+	ValB float64 `perflib:"Something Else"`
+}
+
+func TestUnmarshalPerflib(t *testing.T) {
+	cases := []struct {
+		name string
+		obj  *perflib.PerfObject
+
+		expectedOutput []simple
+		expectError    bool
+	}{
+		{
+			name:           "nil check",
+			obj:            nil,
+			expectedOutput: []simple{},
+			expectError:    true,
+		},
+		{
+			name: "Simple",
+			obj: &perflib.PerfObject{
+				Instances: []*perflib.PerfInstance{
+					{
+						Counters: []*perflib.PerfCounter{
+							{
+								Def: &perflib.PerfCounterDef{
+									Name:        "Something",
+									CounterType: perflibCollector.PERF_COUNTER_COUNTER,
+								},
+								Value: 123,
+							},
+						},
+					},
+				},
+			},
+			expectedOutput: []simple{{ValA: 123}},
+			expectError:    false,
+		},
+		{
+			name: "Multiple properties",
+			obj: &perflib.PerfObject{
+				Instances: []*perflib.PerfInstance{
+					{
+						Counters: []*perflib.PerfCounter{
+							{
+								Def: &perflib.PerfCounterDef{
+									Name:        "Something",
+									CounterType: perflibCollector.PERF_COUNTER_COUNTER,
+								},
+								Value: 123,
+							},
+							{
+								Def: &perflib.PerfCounterDef{
+									Name:        "Something Else",
+									CounterType: perflibCollector.PERF_COUNTER_COUNTER,
+								},
+								Value: 256,
+							},
+						},
+					},
+				},
+			},
+			expectedOutput: []simple{{ValA: 123, ValB: 256}},
+			expectError:    false,
+		},
+		{
+			name: "Multiple instances",
+			obj: &perflib.PerfObject{
+				Instances: []*perflib.PerfInstance{
+					{
+						Counters: []*perflib.PerfCounter{
+							{
+								Def: &perflib.PerfCounterDef{
+									Name:        "Something",
+									CounterType: perflibCollector.PERF_COUNTER_COUNTER,
+								},
+								Value: 321,
+							},
+						},
+					},
+					{
+						Counters: []*perflib.PerfCounter{
+							{
+								Def: &perflib.PerfCounterDef{
+									Name:        "Something",
+									CounterType: perflibCollector.PERF_COUNTER_COUNTER,
+								},
+								Value: 231,
+							},
+						},
+					},
+				},
+			},
+			expectedOutput: []simple{{ValA: 321}, {ValA: 231}},
+			expectError:    false,
+		},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			output := make([]simple, 0)
+			err := unmarshalObject(c.obj, &output)
+			if err != nil && !c.expectError {
+				t.Errorf("Did not expect error, got %q", err)
+			}
+			if err == nil && c.expectError {
+				t.Errorf("Expected an error, but got ok")
+			}
+
+			if err == nil && !reflect.DeepEqual(output, c.expectedOutput) {
+				t.Errorf("Output mismatch, expected %+v, got %+v", c.expectedOutput, output)
+			}
+		})
+	}
+}

collector/thermalzone.go

@@ -0,0 +1,103 @@
+package collector
+
+import (
+	"github.com/StackExchange/wmi"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/common/log"
+)
+
+func init() {
+	Factories["thermalzone"] = NewThermalZoneCollector
+}
+
+// A thermalZoneCollector is a Prometheus collector for WMI Win32_PerfRawData_Counters_ThermalZoneInformation metrics
+type thermalZoneCollector struct {
+	PercentPassiveLimit *prometheus.Desc
+	Temperature         *prometheus.Desc
+	ThrottleReasons     *prometheus.Desc
+}
+
+// NewThermalZoneCollector ...
+func NewThermalZoneCollector() (Collector, error) {
+	const subsystem = "thermalzone"
+	return &thermalZoneCollector{
+		Temperature: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "temperature_celsius"),
+			"(Temperature)",
+			[]string{
+				"name",
+			},
+			nil,
+		),
+		PercentPassiveLimit: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "percent_passive_limit"),
+			"(PercentPassiveLimit)",
+			[]string{
+				"name",
+			},
+			nil,
+		),
+		ThrottleReasons: prometheus.NewDesc(
+			prometheus.BuildFQName(Namespace, subsystem, "throttle_reasons"),
+			"(ThrottleReasons)",
+			[]string{
+				"name",
+			},
+			nil,
+		),
+	}, nil
+}
+
+// Collect sends the metric values for each metric
+// to the provided prometheus Metric channel.
+func (c *thermalZoneCollector) Collect(ctx *ScrapeContext, ch chan<- prometheus.Metric) error {
+	if desc, err := c.collect(ch); err != nil {
+		log.Error("failed collecting thermalzone metrics:", desc, err)
+		return err
+	}
+	return nil
+}
+
+// Win32_PerfRawData_Counters_ThermalZoneInformation docs:
+// https://wutils.com/wmi/root/cimv2/win32_perfrawdata_counters_thermalzoneinformation/
+type Win32_PerfRawData_Counters_ThermalZoneInformation struct {
+	Name string
+
+	HighPrecisionTemperature uint32
+	PercentPassiveLimit      uint32
+	ThrottleReasons          uint32
+}
+
+func (c *thermalZoneCollector) collect(ch chan<- prometheus.Metric) (*prometheus.Desc, error) {
+	var dst []Win32_PerfRawData_Counters_ThermalZoneInformation
+	q := queryAll(&dst)
+	if err := wmi.Query(q, &dst); err != nil {
+		return nil, err
+	}
+
+	for _, info := range dst {
+		//Divide by 10 and subtract 273.15 to convert decikelvin to celsius
+		ch <- prometheus.MustNewConstMetric(
+			c.Temperature,
+			prometheus.GaugeValue,
+			(float64(info.HighPrecisionTemperature)/10.0)-273.15,
+			info.Name,
+		)
+
+		ch <- prometheus.MustNewConstMetric(
+			c.PercentPassiveLimit,
+			prometheus.GaugeValue,
+			float64(info.PercentPassiveLimit),
+			info.Name,
+		)
+
+		ch <- prometheus.MustNewConstMetric(
+			c.ThrottleReasons,
+			prometheus.GaugeValue,
+			float64(info.ThrottleReasons),
+			info.Name,
+		)
+	}
+
+	return nil, nil
+}

docs/collector.mssql.md

@@ -5,14 +5,14 @@ The mssql collector exposes metrics about the MSSQL server
 |||
 -|-
 Metric name prefix  | `mssql`
-Classes             | [`Win32_PerfRawData_MSSQLSERVER_SQLServerAccessMethods`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-access-methods-object)<br/>[`Win32_PerfRawData_MSSQLSERVER_SQLServerAvailabilityReplica`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-availability-replica)<br/>[`Win32_PerfRawData_MSSQLSERVER_SQLServerBufferManager`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-buffer-manager-object)<br/>[`Win32_PerfRawData_MSSQLSERVER_SQLServerDatabaseReplica`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-database-replica)<br/>[`Win32_PerfRawData_MSSQLSERVER_SQLServerDatabases`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-databases-object?view=sql-server-2017)<br/>[`Win32_PerfRawData_MSSQLSERVER_SQLServerGeneralStatistics`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-general-statistics-object)<br/>[`Win32_PerfRawData_MSSQLSERVER_SQLServerLocks`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-locks-object)<br/>[`Win32_PerfRawData_MSSQLSERVER_SQLServerMemoryManager`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-memory-manager-object)<br/>[`Win32_PerfRawData_MSSQLSERVER_SQLServerSQLStatistics`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-sql-statistics-object)
+Classes             | [`Win32_PerfRawData_MSSQLSERVER_SQLServerAccessMethods`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-access-methods-object)<br/>[`Win32_PerfRawData_MSSQLSERVER_SQLServerAvailabilityReplica`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-availability-replica)<br/>[`Win32_PerfRawData_MSSQLSERVER_SQLServerBufferManager`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-buffer-manager-object)<br/>[`Win32_PerfRawData_MSSQLSERVER_SQLServerDatabaseReplica`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-database-replica)<br/>[`Win32_PerfRawData_MSSQLSERVER_SQLServerDatabases`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-databases-object?view=sql-server-2017)<br/>[`Win32_PerfRawData_MSSQLSERVER_SQLServerGeneralStatistics`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-general-statistics-object)<br/>[`Win32_PerfRawData_MSSQLSERVER_SQLServerLocks`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-locks-object)<br/>[`Win32_PerfRawData_MSSQLSERVER_SQLServerMemoryManager`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-memory-manager-object)<br/>[`Win32_PerfRawData_MSSQLSERVER_SQLServerSQLStatistics`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-sql-statistics-object)<br/>[`Win32_PerfRawData_MSSQLSERVER_SQLServerSQLErrors`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-sql-errors-object)<br/>[`Win32_PerfRawData_MSSQLSERVER_SQLServerTransactions`](https://docs.microsoft.com/en-us/sql/relational-databases/performance-monitor/sql-server-transactions-object)
 Enabled by default? | No
 
 ## Flags
 
 ### `--collectors.mssql.classes-enabled`
 
-Comma-separated list of MSSQL WMI classes to use. Supported values are `accessmethods`, `availreplica`, `bufman`, `databases`, `dbreplica`, `genstats`, `locks`, `memmgr` and `sqlstats`.
+Comma-separated list of MSSQL WMI classes to use. Supported values are `accessmethods`, `availreplica`, `bufman`, `databases`, `dbreplica`, `genstats`, `locks`, `memmgr`, `sqlstats`, `sqlerrors` and `transactions`.
 
 ### `--collectors.mssql.class-print`
 
@@ -230,6 +230,20 @@ Name | Description | Type | Labels
 `wmi_mssql_sqlstats_sql_compilations` | _Not yet documented_ | counter | `instance`
 `wmi_mssql_sqlstats_sql_recompilations` | _Not yet documented_ | counter | `instance`
 `wmi_mssql_sqlstats_unsafe_auto_parameterization_attempts` | _Not yet documented_ | counter | `instance`
+`wmi_mssql_sql_errors_total` | _Not yet documented_ | counter | `instance`, `resource`
+`wmi_mssql_transactions_tempdb_free_space_bytes` | _Not yet documented_ | gauge | `instance`
+`wmi_mssql_transactions_longest_transaction_running_seconds` | _Not yet documented_ | gauge | `instance`
+`wmi_mssql_transactions_nonsnapshot_version_active_total` | _Not yet documented_ | counter | `instance`
+`wmi_mssql_transactions_snapshot_active_total` | _Not yet documented_ | counter | `instance`
+`wmi_mssql_transactions_active_total` | _Not yet documented_ | counter | `instance`
+`wmi_mssql_transactions_update_conflicts_total` | _Not yet documented_ | counter | `instance`
+`wmi_mssql_transactions_update_snapshot_active_total` | _Not yet documented_ | counter | `instance`
+`wmi_mssql_transactions_version_cleanup_rate_bytes` | _Not yet documented_ | gauge | `instance`
+`wmi_mssql_transactions_version_generation_rate_bytes` | _Not yet documented_ | gauge | `instance`
+`wmi_mssql_transactions_version_store_size_bytes` | _Not yet documented_ | gauge | `instance`
+`wmi_mssql_transactions_version_store_units` | _Not yet documented_ | counter | `instance`
+`wmi_mssql_transactions_version_store_creation_units` | _Not yet documented_ | counter | `instance`
+`wmi_mssql_transactions_version_store_truncation_units` | _Not yet documented_ | counter | `instance`
 
 ### Example metric
 _This collector does not yet have explained examples, we would appreciate your help adding them!_

docs/collector.service.md

@@ -66,10 +66,42 @@ A service can have any of the following statuses:
 Note that there is some overlap with service state.
 
 ### Example metric
-_This collector does not yet have explained examples, we would appreciate your help adding them!_
+Lists the services that have a 'disabled' start mode.
+```
+wmi_service_start_mode{exported_name=~"(mssqlserver|sqlserveragent)",start_mode="disabled"}
+```
 
 ## Useful queries
-_This collector does not yet have any useful queries added, we would appreciate your help adding them!_
+Counts the number of Microsoft SQL Server/Agent Processes
+```
+count(wmi_service_state{exported_name=~"(sqlserveragent|mssqlserver)",state="running"})
+```
 
 ## Alerting examples
-_This collector does not yet have alerting examples, we would appreciate your help adding them!_
+**prometheus.rules**
+```
+groups:
+- name: Microsoft SQL Server Alerts
+  rules:
+
+  # Sends an alert when the 'sqlserveragent' service is not in the running state for 3 minutes. 
+  - alert: SQL Server Agent DOWN
+    expr: wmi_service_state{instance="SQL",exported_name="sqlserveragent",state="running"} == 0
+    for: 3m
+    labels:
+      severity: high
+    annotations:
+      summary: "Service {{ $labels.exported_name }} down"
+      description: "Service {{ $labels.exported_name }} on instance {{ $labels.instance }} has been down for more than 3 minutes."
+      
+  # Sends an alert when the 'mssqlserver' service is not in the running state for 3 minutes. 
+  - alert: SQL Server DOWN
+    expr: wmi_service_state{instance="SQL",exported_name="mssqlserver",state="running"} == 0
+    for: 3m
+    labels:
+      severity: high
+    annotations:
+      summary: "Service {{ $labels.exported_name }} down"
+      description: "Service {{ $labels.exported_name }} on instance {{ $labels.instance }} has been down for more than 3 minutes."
+```
+In this example, `instance` is the target label of the host. So each alert will be processed per host, which is then used in the alert description.

docs/collector.thermalzone.md

@@ -0,0 +1,32 @@
+# thermalzone collector
+
+The thermalzone collector exposes metrics about system temps. Note that temperature is given in Kelvin
+
+|||
+-|-
+Metric name prefix  | `thermalzone`
+Classes             | [`Win32_PerfRawData_Counters_ThermalZoneInformation`](https://wutils.com/wmi/root/cimv2/win32_perfrawdata_counters_thermalzoneinformation/#temperature_properties)
+Enabled by default? | No
+
+## Flags
+
+None
+
+## Metrics
+
+Name | Description | Type | Labels
+-----|-------------|------|-------
+`wmi_thermalzone_percent_passive_limit` | % Passive Limit is the current limit this thermal zone is placing on the devices it controls. A limit of 100% indicates the devices are unconstrained. A limit of 0% indicates the devices are fully constrained. | gauge | None
+`wmi_thermalzone_temperature_celsius ` | Temperature of the thermal zone, in degrees Celsius. | gauge | None
+`wmi_thermalzone_throttle_reasons ` | Throttle Reasons indicate reasons why the thermal zone is limiting performance of the devices it controls. 0x0 – The zone is not throttled. 0x1 – The zone is throttled for thermal reasons. 0x2 – The zone is throttled to limit electrical current. | gauge | None
+
+[`Throttle reasons` source](https://docs.microsoft.com/en-us/windows-hardware/design/device-experiences/examples--requirements-and-diagnostics)
+
+### Example metric
+_This collector does not yet have explained examples, we would appreciate your help adding them!_
+
+## Useful queries
+_This collector does not yet have any useful queries added, we would appreciate your help adding them!_
+
+## Alerting examples
+_This collector does not yet have alerting examples, we would appreciate your help adding them!_

exporter.go

@@ -5,7 +5,9 @@ package main
 import (
 	"fmt"
 	"net/http"
+	"os"
 	"sort"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -52,6 +54,12 @@ var (
 		[]string{"collector"},
 		nil,
 	)
+	snapshotDuration = prometheus.NewDesc(
+		prometheus.BuildFQName(collector.Namespace, "exporter", "perflib_snapshot_duration_seconds"),
+		"Duration of perflib snapshot capture",
+		nil,
+		nil,
+	)
 
 	// This can be removed when client_golang exposes this on Windows
 	// (See https://github.com/prometheus/client_golang/issues/376)
@@ -71,84 +79,112 @@ func (coll WmiCollector) Describe(ch chan<- *prometheus.Desc) {
 	ch <- scrapeSuccessDesc
 }
 
+type collectorOutcome int
+
+const (
+	pending collectorOutcome = iota
+	success
+	failed
+)
+
 // Collect sends the collected metrics from each of the collectors to
 // prometheus.
 func (coll WmiCollector) Collect(ch chan<- prometheus.Metric) {
-	scrapeContext, err := collector.PrepareScrapeContext()
-	if err != nil {
-		ch <- prometheus.NewInvalidMetric(scrapeSuccessDesc, fmt.Errorf("failed to prepare scrape: %v", err))
-		return
-	}
-
-	remainingCollectors := make(map[string]bool)
-	for name := range coll.collectors {
-		remainingCollectors[name] = true
-	}
-
-	metricsBuffer := make(chan prometheus.Metric)
-	allDone := make(chan struct{})
-	stopped := false
-	go func() {
-		for {
-			select {
-			case m := <-metricsBuffer:
-				if !stopped {
-					ch <- m
-				}
-			case <-allDone:
-				return
-			}
-		}
-	}()
-
-	wg := sync.WaitGroup{}
-	wg.Add(len(coll.collectors))
-	go func() {
-		wg.Wait()
-		close(allDone)
-		close(metricsBuffer)
-	}()
-
-	for name, c := range coll.collectors {
-		go func(name string, c collector.Collector) {
-			execute(name, c, scrapeContext, metricsBuffer)
-			wg.Done()
-			delete(remainingCollectors, name)
-		}(name, c)
-	}
-
 	ch <- prometheus.MustNewConstMetric(
 		startTimeDesc,
 		prometheus.CounterValue,
 		startTime,
 	)
 
+	t := time.Now()
+	scrapeContext, err := collector.PrepareScrapeContext()
+	ch <- prometheus.MustNewConstMetric(
+		snapshotDuration,
+		prometheus.GaugeValue,
+		time.Since(t).Seconds(),
+	)
+	if err != nil {
+		ch <- prometheus.NewInvalidMetric(scrapeSuccessDesc, fmt.Errorf("failed to prepare scrape: %v", err))
+		return
+	}
+
+	wg := sync.WaitGroup{}
+	wg.Add(len(coll.collectors))
+	collectorOutcomes := make(map[string]collectorOutcome)
+	for name := range coll.collectors {
+		collectorOutcomes[name] = pending
+	}
+
+	metricsBuffer := make(chan prometheus.Metric)
+	l := sync.Mutex{}
+	finished := false
+	go func() {
+		for m := range metricsBuffer {
+			l.Lock()
+			if !finished {
+				ch <- m
+			}
+			l.Unlock()
+		}
+	}()
+
+	for name, c := range coll.collectors {
+		go func(name string, c collector.Collector) {
+			defer wg.Done()
+			outcome := execute(name, c, scrapeContext, metricsBuffer)
+			l.Lock()
+			if !finished {
+				collectorOutcomes[name] = outcome
+			}
+			l.Unlock()
+		}(name, c)
+	}
+
+	allDone := make(chan struct{})
+	go func() {
+		wg.Wait()
+		close(allDone)
+	}()
+
+	// Wait until either all collectors finish, or timeout expires
 	select {
 	case <-allDone:
-		stopped = true
-		return
 	case <-time.After(coll.maxScrapeDuration):
-		stopped = true
-		remainingCollectorNames := make([]string, 0, len(remainingCollectors))
-		for rc := range remainingCollectors {
-			remainingCollectorNames = append(remainingCollectorNames, rc)
-		}
-		log.Warn("Collection timed out, still waiting for ", remainingCollectorNames)
-		for name := range remainingCollectors {
-			ch <- prometheus.MustNewConstMetric(
-				scrapeSuccessDesc,
-				prometheus.GaugeValue,
-				0.0,
-				name,
-			)
-			ch <- prometheus.MustNewConstMetric(
-				scrapeTimeoutDesc,
-				prometheus.GaugeValue,
-				1.0,
-				name,
-			)
-		}
 	}
+
+	l.Lock()
+	finished = true
+
+	remainingCollectorNames := make([]string, 0)
+	for name, outcome := range collectorOutcomes {
+		var successValue, timeoutValue float64
+		if outcome == pending {
+			timeoutValue = 1.0
+			remainingCollectorNames = append(remainingCollectorNames, name)
+		}
+		if outcome == success {
+			successValue = 1.0
+		}
+
+		ch <- prometheus.MustNewConstMetric(
+			scrapeSuccessDesc,
+			prometheus.GaugeValue,
+			successValue,
+			name,
+		)
+		ch <- prometheus.MustNewConstMetric(
+			scrapeTimeoutDesc,
+			prometheus.GaugeValue,
+			timeoutValue,
+			name,
+		)
+	}
+
+	if len(remainingCollectorNames) > 0 {
+		log.Warn("Collection timed out, still waiting for ", remainingCollectorNames)
+	}
+
+	l.Unlock()
 }
 
 func filterAvailableCollectors(collectors string) string {
@@ -162,37 +198,23 @@ func filterAvailableCollectors(collectors string) string {
 	return strings.Join(availableCollectors, ",")
 }
 
-func execute(name string, c collector.Collector, ctx *collector.ScrapeContext, ch chan<- prometheus.Metric) {
+func execute(name string, c collector.Collector, ctx *collector.ScrapeContext, ch chan<- prometheus.Metric) collectorOutcome {
-	begin := time.Now()
+	t := time.Now()
 	err := c.Collect(ctx, ch)
-	duration := time.Since(begin)
+	duration := time.Since(t).Seconds()
-	var success float64
-
-	if err != nil {
-		log.Errorf("collector %s failed after %fs: %s", name, duration.Seconds(), err)
-		success = 0
-	} else {
-		log.Debugf("collector %s succeeded after %fs.", name, duration.Seconds())
-		success = 1
-	}
 	ch <- prometheus.MustNewConstMetric(
 		scrapeDurationDesc,
 		prometheus.GaugeValue,
-		duration.Seconds(),
+		duration,
-		name,
-	)
-	ch <- prometheus.MustNewConstMetric(
-		scrapeSuccessDesc,
-		prometheus.GaugeValue,
-		success,
-		name,
-	)
-	ch <- prometheus.MustNewConstMetric(
-		scrapeTimeoutDesc,
-		prometheus.GaugeValue,
-		0.0,
 		name,
 	)
+
+	if err != nil {
+		log.Errorf("collector %s failed after %fs: %s", name, duration, err)
+		return failed
+	}
+	log.Debugf("collector %s succeeded after %fs.", name, duration)
+	return success
 }
 
 func expandEnabledCollectors(enabled string) []string {
@@ -229,10 +251,6 @@ func loadCollectors(list string) (map[string]collector.Collector, error) {
 	return collectors, nil
 }
 
-func init() {
-	prometheus.MustRegister(version.NewCollector("wmi_exporter"))
-}
-
 func initWbem() {
 	// This initialization prevents a memory leak on WMF 5+. See
 	// https://github.com/martinlindhe/wmi_exporter/issues/77 and linked issues
@@ -264,10 +282,10 @@ func main() {
 			"collectors.print",
 			"If true, print available collectors and exit.",
 		).Bool()
-		maxScrapeDuration = kingpin.Flag(
+		timeoutMargin = kingpin.Flag(
-			"scrape.max-duration",
+			"scrape.timeout-margin",
-			"Time after which collectors are aborted during a scrape",
+			"Seconds to subtract from the timeout allowed by the client. Tune to allow for overhead or high loads.",
-		).Default("30s").Duration()
+		).Default("0.5").Float64()
 	)
 
 	log.AddFlags(kingpin.CommandLine)
@@ -312,13 +330,17 @@ func main() {
 
 	log.Infof("Enabled collectors: %v", strings.Join(keys(collectors), ", "))
 
-	exporter := WmiCollector{
+	h := &metricsHandler{
-		collectors:        collectors,
+		timeoutMargin: *timeoutMargin,
-		maxScrapeDuration: *maxScrapeDuration,
+		collectorFactory: func(timeout time.Duration) *WmiCollector {
+			return &WmiCollector{
+				collectors:        collectors,
+				maxScrapeDuration: timeout,
+			}
+		},
 	}
-	prometheus.MustRegister(exporter)
 
-	http.Handle(*metricsPath, promhttp.Handler())
+	http.Handle(*metricsPath, h)
 	http.HandleFunc("/health", healthCheck)
 	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 		http.Redirect(w, r, *metricsPath, http.StatusMovedPermanently)
@@ -382,3 +404,36 @@ loop:
 	changes <- svc.Status{State: svc.StopPending}
 	return
 }
+
+type metricsHandler struct {
+	timeoutMargin    float64
+	collectorFactory func(timeout time.Duration) *WmiCollector
+}
+
+func (mh *metricsHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	const defaultTimeout = 10.0
+
+	var timeoutSeconds float64
+	if v := r.Header.Get("X-Prometheus-Scrape-Timeout-Seconds"); v != "" {
+		var err error
+		timeoutSeconds, err = strconv.ParseFloat(v, 64)
+		if err != nil {
+			log.Warnf("Couldn't parse X-Prometheus-Scrape-Timeout-Seconds: %q. Defaulting timeout to %f", v, defaultTimeout)
+		}
+	}
+	if timeoutSeconds == 0 {
+		timeoutSeconds = defaultTimeout
+	}
+	timeoutSeconds = timeoutSeconds - mh.timeoutMargin
+
+	reg := prometheus.NewRegistry()
+	reg.MustRegister(mh.collectorFactory(time.Duration(timeoutSeconds * float64(time.Second))))
+	reg.MustRegister(
+		prometheus.NewProcessCollector(os.Getpid(), ""),
+		prometheus.NewGoCollector(),
+		version.NewCollector("wmi_exporter"),
+	)
+
+	h := promhttp.HandlerFor(reg, promhttp.HandlerOpts{})
+	h.ServeHTTP(w, r)
+}

tools/collector-generator/New-Collector.ps1

@@ -20,7 +20,7 @@ else {
 $members = $wmiObject `
     | Get-Member -MemberType Properties `
     | Where-Object { $_.Definition -Match '^u?int' -and $_.Name -NotMatch '_' } `
-    | Select-Object Name, @{Name="Type";Expression={$_.Definition.Split(" ")[0]}}
+    | Select-Object Name, @{Name="Type";Expression={$_.Definition.Split(" ")[0]}})
 $input = @{
     "Class"=$Class;
     "CollectorName"=$CollectorName;

tools/collector-generator/collector.template

@@ -29,7 +29,7 @@ func New{{ .CollectorName }}Collector() (Collector, error) {
 }
 // Collect sends the metric values for each metric
 // to the provided prometheus Metric channel.
-func (c *{{ .CollectorName }}Collector) Collect(ch chan<- prometheus.Metric) error {
+func (c *{{ .CollectorName }}Collector) Collect(ctx *ScrapeContext, ch chan<- prometheus.Metric) error {
     if desc, err := c.collect(ch); err != nil {
         log.Error("failed collecting {{ .CollectorName | toLower }} metrics:", desc, err)
         return err