diff --git a/web/api/v1/api.go b/web/api/v1/api.go
index 762801231..6295564d6 100644
--- a/web/api/v1/api.go
+++ b/web/api/v1/api.go
@@ -498,40 +498,51 @@ type DroppedTarget struct {
 
 // TargetDiscovery has all the active targets.
 type TargetDiscovery struct {
-	ActiveTargets  map[string][]*Target        `json:"activeTargets"`
-	DroppedTargets map[string][]*DroppedTarget `json:"droppedTargets"`
+	ActiveTargets  []*Target        `json:"activeTargets"`
+	DroppedTargets []*DroppedTarget `json:"droppedTargets"`
 }
 
 func (api *API) targets(r *http.Request) (interface{}, *apiError, func()) {
-	tActive := api.targetRetriever.TargetsActive()
-	tDropped := api.targetRetriever.TargetsDropped()
-	res := &TargetDiscovery{ActiveTargets: make(map[string][]*Target, len(tActive)), DroppedTargets: make(map[string][]*DroppedTarget, len(tDropped))}
-
-	for tset, targets := range tActive {
-		for _, target := range targets {
-			lastErrStr := ""
-			lastErr := target.LastError()
-			if lastErr != nil {
-				lastErrStr = lastErr.Error()
-			}
-
-			res.ActiveTargets[tset] = append(res.ActiveTargets[tset], &Target{
-				DiscoveredLabels: target.DiscoveredLabels().Map(),
-				Labels:           target.Labels().Map(),
-				ScrapeURL:        target.URL().String(),
-				LastError:        lastErrStr,
-				LastScrape:       target.LastScrape(),
-				Health:           target.Health(),
-			})
+	flatten := func(targets map[string][]*scrape.Target) []*scrape.Target {
+		var n int
+		keys := make([]string, 0, len(targets))
+		for k := range targets {
+			keys = append(keys, k)
+			n += len(targets[k])
+		}
+		sort.Strings(keys)
+		res := make([]*scrape.Target, 0, n)
+		for _, k := range keys {
+			res = append(res, targets[k]...)
 		}
+		return res
 	}
 
-	for tset, tt := range tDropped {
-		for _, t := range tt {
-			res.DroppedTargets[tset] = append(res.DroppedTargets[tset], &DroppedTarget{
-				DiscoveredLabels: t.DiscoveredLabels().Map(),
-			})
+	tActive := flatten(api.targetRetriever.TargetsActive())
+	tDropped := flatten(api.targetRetriever.TargetsDropped())
+	res := &TargetDiscovery{ActiveTargets: make([]*Target, 0, len(tActive)), DroppedTargets: make([]*DroppedTarget, 0, len(tDropped))}
+
+	for _, target := range tActive {
+		lastErrStr := ""
+		lastErr := target.LastError()
+		if lastErr != nil {
+			lastErrStr = lastErr.Error()
 		}
+
+		res.ActiveTargets = append(res.ActiveTargets, &Target{
+			DiscoveredLabels: target.DiscoveredLabels().Map(),
+			Labels:           target.Labels().Map(),
+			ScrapeURL:        target.URL().String(),
+			LastError:        lastErrStr,
+			LastScrape:       target.LastScrape(),
+			Health:           target.Health(),
+		})
+	}
+
+	for _, t := range tDropped {
+		res.DroppedTargets = append(res.DroppedTargets, &DroppedTarget{
+			DiscoveredLabels: t.DiscoveredLabels().Map(),
+		})
 	}
 	return res, nil, nil
 }
diff --git a/web/api/v1/api_test.go b/web/api/v1/api_test.go
index a3e569cc0..ea7ff203b 100644
--- a/web/api/v1/api_test.go
+++ b/web/api/v1/api_test.go
@@ -61,16 +61,29 @@ func (t testTargetRetriever) TargetsActive() map[string][]*scrape.Target {
 					model.SchemeLabel:      "http",
 					model.AddressLabel:     "example.com:8080",
 					model.MetricsPathLabel: "/metrics",
+					model.JobLabel:         "test",
 				}),
 				nil,
 				url.Values{},
 			),
 		},
+		"blackbox": {
+			scrape.NewTarget(
+				labels.FromMap(map[string]string{
+					model.SchemeLabel:      "http",
+					model.AddressLabel:     "localhost:9115",
+					model.MetricsPathLabel: "/probe",
+					model.JobLabel:         "blackbox",
+				}),
+				nil,
+				url.Values{"target": []string{"example.com"}},
+			),
+		},
 	}
 }
 func (t testTargetRetriever) TargetsDropped() map[string][]*scrape.Target {
 	return map[string][]*scrape.Target{
-		"test": {
+		"blackbox": {
 			scrape.NewTarget(
 				nil,
 				labels.FromMap(map[string]string{
@@ -628,25 +641,31 @@ func testEndpoints(t *testing.T, api *API, testLabelAPI bool) {
 		{
 			endpoint: api.targets,
 			response: &TargetDiscovery{
-				ActiveTargets: map[string][]*Target{
-					"test": {
-						{
-							DiscoveredLabels: map[string]string{},
-							Labels:           map[string]string{},
-							ScrapeURL:        "http://example.com:8080/metrics",
-							Health:           "unknown",
+				ActiveTargets: []*Target{
+					{
+						DiscoveredLabels: map[string]string{},
+						Labels: map[string]string{
+							"job": "blackbox",
+						},
+						ScrapeURL: "http://localhost:9115/probe?target=example.com",
+						Health:    "unknown",
+					},
+					{
+						DiscoveredLabels: map[string]string{},
+						Labels: map[string]string{
+							"job": "test",
 						},
+						ScrapeURL: "http://example.com:8080/metrics",
+						Health:    "unknown",
 					},
 				},
-				DroppedTargets: map[string][]*DroppedTarget{
-					"test": {
-						{
-							DiscoveredLabels: map[string]string{
-								"__address__":      "http://dropped.example.com:9115",
-								"__metrics_path__": "/probe",
-								"__scheme__":       "http",
-								"job":              "blackbox",
-							},
+				DroppedTargets: []*DroppedTarget{
+					{
+						DiscoveredLabels: map[string]string{
+							"__address__":      "http://dropped.example.com:9115",
+							"__metrics_path__": "/probe",
+							"__scheme__":       "http",
+							"job":              "blackbox",
 						},
 					},
 				},