Constantize job name label.

model/labelname.go

@@ -16,6 +16,9 @@ package model
 // The label name used to indicate the metric name of a timeseries.
 const MetricNameLabel = LabelName("name")
 
+// The label name used to indicate the job from which a timeseries was scraped.
+const JobLabel = LabelName("job")
+
 // A LabelName is a key for a LabelSet or Metric.  It has a value associated
 // therewith.
 type LabelName string

retrieval/targetmanager.go

@@ -89,7 +89,7 @@ func (m *targetManager) AddTargetsFromConfig(config *config.Config) {
 	for _, job := range config.Jobs {
 		for _, configTargets := range job.Targets {
 			baseLabels := model.LabelSet{
-				model.LabelName("job"): model.LabelValue(job.Name),
+				model.JobLabel: model.LabelValue(job.Name),
 			}
 			for label, value := range configTargets.Labels {
 				baseLabels[label] = value

rules/ast/functions.go

@@ -167,7 +167,7 @@ func sampleVectorImpl(timestamp time.Time, view *viewAdapter, args []Node) inter
 		model.Sample{
 			Metric: model.Metric{
 				model.MetricNameLabel: "http_requests",
-				"job":                 "api-server",
+				model.JobLabel:        "api-server",
 				"instance":            "0",
 			},
 			Value:     10,
@@ -176,7 +176,7 @@ func sampleVectorImpl(timestamp time.Time, view *viewAdapter, args []Node) inter
 		model.Sample{
 			Metric: model.Metric{
 				model.MetricNameLabel: "http_requests",
-				"job":                 "api-server",
+				model.JobLabel:        "api-server",
 				"instance":            "1",
 			},
 			Value:     20,
@@ -185,7 +185,7 @@ func sampleVectorImpl(timestamp time.Time, view *viewAdapter, args []Node) inter
 		model.Sample{
 			Metric: model.Metric{
 				model.MetricNameLabel: "http_requests",
-				"job":                 "api-server",
+				model.JobLabel:        "api-server",
 				"instance":            "2",
 			},
 			Value:     30,
@@ -194,7 +194,7 @@ func sampleVectorImpl(timestamp time.Time, view *viewAdapter, args []Node) inter
 		model.Sample{
 			Metric: model.Metric{
 				model.MetricNameLabel: "http_requests",
-				"job":                 "api-server",
+				model.JobLabel:        "api-server",
 				"instance":            "3",
 				"group":               "canary",
 			},
@@ -204,7 +204,7 @@ func sampleVectorImpl(timestamp time.Time, view *viewAdapter, args []Node) inter
 		model.Sample{
 			Metric: model.Metric{
 				model.MetricNameLabel: "http_requests",
-				"job":                 "api-server",
+				model.JobLabel:        "api-server",
 				"instance":            "2",
 				"group":               "canary",
 			},
@@ -214,7 +214,7 @@ func sampleVectorImpl(timestamp time.Time, view *viewAdapter, args []Node) inter
 		model.Sample{
 			Metric: model.Metric{
 				model.MetricNameLabel: "http_requests",
-				"job":                 "api-server",
+				model.JobLabel:        "api-server",
 				"instance":            "3",
 				"group":               "mytest",
 			},
@@ -224,7 +224,7 @@ func sampleVectorImpl(timestamp time.Time, view *viewAdapter, args []Node) inter
 		model.Sample{
 			Metric: model.Metric{
 				model.MetricNameLabel: "http_requests",
-				"job":                 "api-server",
+				model.JobLabel:        "api-server",
 				"instance":            "3",
 				"group":               "mytest",
 			},

rules/testdata.go

@@ -71,7 +71,7 @@ var testMatrix = ast.Matrix{
 	{
 		Metric: model.Metric{
 			model.MetricNameLabel: "http_requests",
-			"job":                 "api-server",
+			model.JobLabel:        "api-server",
 			"instance":            "0",
 			"group":               "production",
 		},
@@ -80,7 +80,7 @@ var testMatrix = ast.Matrix{
 	{
 		Metric: model.Metric{
 			model.MetricNameLabel: "http_requests",
-			"job":                 "api-server",
+			model.JobLabel:        "api-server",
 			"instance":            "1",
 			"group":               "production",
 		},
@@ -89,7 +89,7 @@ var testMatrix = ast.Matrix{
 	{
 		Metric: model.Metric{
 			model.MetricNameLabel: "http_requests",
-			"job":                 "api-server",
+			model.JobLabel:        "api-server",
 			"instance":            "0",
 			"group":               "canary",
 		},
@@ -98,7 +98,7 @@ var testMatrix = ast.Matrix{
 	{
 		Metric: model.Metric{
 			model.MetricNameLabel: "http_requests",
-			"job":                 "api-server",
+			model.JobLabel:        "api-server",
 			"instance":            "1",
 			"group":               "canary",
 		},
@@ -107,7 +107,7 @@ var testMatrix = ast.Matrix{
 	{
 		Metric: model.Metric{
 			model.MetricNameLabel: "http_requests",
-			"job":                 "app-server",
+			model.JobLabel:        "app-server",
 			"instance":            "0",
 			"group":               "production",
 		},
@@ -116,7 +116,7 @@ var testMatrix = ast.Matrix{
 	{
 		Metric: model.Metric{
 			model.MetricNameLabel: "http_requests",
-			"job":                 "app-server",
+			model.JobLabel:        "app-server",
 			"instance":            "1",
 			"group":               "production",
 		},
@@ -125,7 +125,7 @@ var testMatrix = ast.Matrix{
 	{
 		Metric: model.Metric{
 			model.MetricNameLabel: "http_requests",
-			"job":                 "app-server",
+			model.JobLabel:        "app-server",
 			"instance":            "0",
 			"group":               "canary",
 		},
@@ -134,7 +134,7 @@ var testMatrix = ast.Matrix{
 	{
 		Metric: model.Metric{
 			model.MetricNameLabel: "http_requests",
-			"job":                 "app-server",
+			model.JobLabel:        "app-server",
 			"instance":            "1",
 			"group":               "canary",
 		},

web/api/targets.go

@@ -34,7 +34,7 @@ func (serv MetricsService) SetTargets(targetGroups []TargetGroup, jobName string
 		for _, targetGroup := range targetGroups {
 			// Do mandatory map type conversion due to Go shortcomings.
 			baseLabels := model.LabelSet{
-				model.LabelName("job"): model.LabelValue(job.Name),
+				model.JobLabel: model.LabelValue(job.Name),
 			}
 			for label, value := range targetGroup.BaseLabels {
 				baseLabels[model.LabelName(label)] = model.LabelValue(value)