Print flags on status page.

web/static/css/prometheus.css

@@ -35,6 +35,10 @@ input:not([type=submit]):not([type=file]):not([type=button]) {
   float: right;
 }
 
+table tbody th {
+  text-align: left;
+}
+
 input {
   margin: 0;
   border: 1px solid gray;

web/status.go

@@ -14,6 +14,7 @@
 package web
 
 import (
+	"flag"
 	"github.com/prometheus/prometheus/appstate"
 	"github.com/prometheus/prometheus/retrieval"
 	"net/http"
@@ -25,6 +26,7 @@ type PrometheusStatus struct {
 	Status      string
 	TargetPools map[string]*retrieval.TargetPool
 	BuildInfo   map[string]string
+	Flags       map[string]string
 }
 
 type StatusHandler struct {
@@ -32,12 +34,19 @@ type StatusHandler struct {
 }
 
 func (h *StatusHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	flags := map[string]string{}
+
+	flag.VisitAll(func(f *flag.Flag) {
+		flags[f.Name] = f.Value.String()
+	})
+
 	status := &PrometheusStatus{
 		Config:      h.appState.Config.ToString(0),
 		Rules:       "TODO: list rules here",
 		Status:      "TODO: add status information here",
 		TargetPools: h.appState.TargetManager.Pools(),
 		BuildInfo:   h.appState.BuildInfo,
+		Flags:       flags,
 	}
 	executeTemplate(w, "status", status)
 }

web/templates/status.html

@@ -38,12 +38,28 @@
     <h2>Build Info</h2>
     <div class="grouping_box">
       <table>
-        {{range $key, $value := .BuildInfo}}
-        <tr>
-          <th scope="row">{{$key}}</th>
-          <td>{{$value}}</td>
-        </tr>
-        {{end}}
+        <tbody>
+          {{range $key, $value := .BuildInfo}}
+          <tr>
+            <th scope="row">{{$key}}</th>
+            <td>{{$value}}</td>
+          </tr>
+          {{end}}
+        </tbody>
+      </table>
+    </div>
+
+    <h2>Startup Flags</h2>
+    <div class="grouping_box">
+      <table>
+        <tbody>
+          {{range $key, $value := .Flags}}
+          <tr>
+            <th scope="row">{{$key}}</th>
+            <td>{{$value}}</td>
+          </tr>
+          {{end}}
+        </tbody>
       </table>
     </div>
 {{end}}