add service discovery template

pkg/promtail/server/ui/assets_vfsdata.go

@@ -451,9 +451,16 @@ var Assets = func() http.FileSystem {
 		"/templates/_base.html": &vfsgen۰CompressedFileInfo{
 			name:             "_base.html",
 			modTime:          time.Date(1970, 1, 1, 0, 0, 1, 0, time.UTC),
-			uncompressedSize: 2650,
+			uncompressedSize: 2784,
 
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+		},
+		"/templates/service-discovery.html": &vfsgen۰CompressedFileInfo{
+			name:             "service-discovery.html",
+			modTime:          time.Date(1970, 1, 1, 0, 0, 1, 0, time.UTC),
+			uncompressedSize: 2774,
+
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 		},
 		"/templates/targets.html": &vfsgen۰CompressedFileInfo{
 			name:             "targets.html",
@@ -569,6 +576,7 @@ var Assets = func() http.FileSystem {
 	}
 	fs["/templates"].(*vfsgen۰DirInfo).entries = []os.FileInfo{
 		fs["/templates/_base.html"].(os.FileInfo),
+		fs["/templates/service-discovery.html"].(os.FileInfo),
 		fs["/templates/targets.html"].(os.FileInfo),
 	}
 

pkg/promtail/server/ui/templates/_base.html

@@ -41,6 +41,7 @@
 
                 <div id="nav-content" class="navbar-collapse collapse">
                     <ul class="navbar-nav">
+                        <li class="nav-item"><a class="nav-link" href="{{ pathPrefix }}/service-discovery">Service Discovery</a></li>
                         <li class="nav-item"><a class="nav-link" href="{{ pathPrefix }}/targets">Targets</a></li>
                         <li class= "nav-item" >
                             <a class ="nav-link" href="https://github.com/grafana/loki" target="_blank">Help</a>

pkg/promtail/server/ui/templates/service-discovery.html

@@ -0,0 +1,92 @@
+{{define "head"}}
+<link type="text/css" rel="stylesheet" href="{{ pathPrefix }}/static/css/targets.css?v={{ buildVersion }}">
+<script src="{{ pathPrefix }}/static/js/targets.js?v={{ buildVersion }}"></script>
+{{end}}
+
+<style>
+  *[id]:before {
+    display: block;
+    content: " ";
+    margin-top: -65px;
+    height: 65px;
+    visibility: hidden;
+  }
+</style>
+
+{{define "content"}}
+  <div class="container-fluid">
+
+    <h1>Service Discovery</h1>
+    <div>
+      <ul>
+        {{range $i, $job := .Index}}
+          <li>
+            <a href="#job-{{$job}}">{{$job}}</a> ({{ index $.Active $i }}/{{ index $.Total $i }} active targets)
+          </li>
+        {{end}}
+      </ul>
+    </div>
+
+    {{$targets := .Targets}}
+    {{range $i, $job := .Index}}
+
+    <div class="table-container">
+      <h2 class="job_header" id="job-{{$job}}">
+        {{$job}}
+        <button type="button" class="targets collapsed-table btn btn-primary">show more</button>
+      </h2>
+      {{with index $.Dropped $i}}
+      {{if gt . 100 }}
+      <div class="collapsed-element" style="display:none">
+        {{ . }} targets have been dropped, showing only the first 100 dropped targets as examples.
+      </div>
+      {{end}}
+      {{end}}
+      <table class="table table-sm table-bordered table-striped table-hover" style="display:none">
+        <thead class="job_details">
+          <tr>
+            <th>Discovered Labels</th>
+            <th>Target Labels</th>
+          </tr>
+        </thead>
+        <tbody>
+
+        {{range index $targets $job}}
+          <tr>
+            <td class="labels">
+                {{$labels := .DiscoveredLabels }}
+                <ul class="list-inline" style="list-style-type:none">
+                  {{range $label, $value := $labels}}
+                    <li>
+                      <span class="badge badge-primary">{{$label}}="{{$value}}"</span>
+                    </li>
+                  {{else}}
+                  <li>
+                    <span class="badge badge-default">none</span>
+                  </li>
+                  {{end}}
+                </ul>
+            </td>
+            <td class="labels">
+                {{$labels := .Labels }}
+                <ul class="list-inline" style="list-style-type:none">
+                  {{range $label, $value := $labels}}
+                    <li>
+                      <span class="badge badge-primary">{{$label}}="{{$value}}"</span>
+                    </li>
+                  {{else}}
+                    <li>
+                      <span class="badge badge-default">Dropped: {{ dropReason .Details }}</span>
+                    </li>
+                  {{end}}
+                </ul>
+            </td>
+          </tr>
+        {{end}}
+        </tbody>
+      </table>
+    </div>
+    {{ end }}
+  </div>
+
+{{end}}

pkg/promtail/targets/filetargetmanager.go

@@ -247,7 +247,7 @@ func (s *targetSyncer) DroppedTargets() []Target {
 func (s *targetSyncer) ActiveTargets() []Target {
 	s.mtx.Lock()
 	defer s.mtx.Unlock()
-	actives := make([]Target, len(s.targets))
+	actives := []Target{}
 	for _, t := range s.targets {
 		actives = append(actives, t)
 	}