Allow setting the Prometheus instance document title through a flag. (#4841)

* web: added ability to set page title through flag.

Signed-off-by: Andrew Chiu <andrew.chiu2@baesystems.com>

* Reformatted variable names and Flag description for readability.

Signed-off-by: Andrew Chiu <andrew.chiu2@baesystems.com>

* assets_vfsdata.go

Signed-off-by: Andrew Chiu <andrew.chiu2@baesystems.com>

* Flag name changed from web.ui-title to web.page-title

Signed-off-by: Andrew Chiu <andrew.chiu2@baesystems.com>

* make assets

Signed-off-by: Andrew Chiu <andrew.chiu2@baesystems.com>

cmd/prometheus/main.go

@@ -150,6 +150,9 @@ func main() {
 	a.Flag("web.console.libraries", "Path to the console library directory.").
 		Default("console_libraries").StringVar(&cfg.web.ConsoleLibrariesPath)
 
+	a.Flag("web.page-title", "Document title of Prometheus instance.").
+		Default("Prometheus Time Series Collection and Processing Server").StringVar(&cfg.web.PageTitle)
+
 	a.Flag("storage.tsdb.path", "Base path for metrics storage.").
 		Default("data/").StringVar(&cfg.localStoragePath)
 

web/ui/assets_vfsdata.go

@@ -361,9 +361,9 @@ 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: 3042,
+			uncompressedSize: 3002,
 
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 		},
 		"/templates/alerts.html": &vfsgen۰CompressedFileInfo{
 			name:             "alerts.html",

web/ui/templates/_base.html

@@ -3,7 +3,7 @@
   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
     <meta name="robots" content="noindex,nofollow">
-    <title>Prometheus Time Series Collection and Processing Server</title>
+    <title>{{ pageTitle }}</title>
     <link rel="shortcut icon" href="{{ pathPrefix }}/static/img/favicon.ico?v={{ buildVersion }}">
     <script src="{{ pathPrefix }}/static/vendor/js/jquery.min.js?v={{ buildVersion }}"></script>
     <script src="{{ pathPrefix }}/static/vendor/bootstrap-3.3.1/js/bootstrap.min.js?v={{ buildVersion }}"></script>

web/web.go

@@ -186,6 +186,7 @@ type Options struct {
 	ConsoleLibrariesPath       string
 	EnableLifecycle            bool
 	EnableAdminAPI             bool
+	PageTitle                  string
 	RemoteReadSampleLimit      int
 	RemoteReadConcurrencyLimit int
 }
@@ -751,6 +752,7 @@ func tmplFuncs(consolesPath string, opts *Options) template_text.FuncMap {
 		},
 		"consolesPath": func() string { return consolesPath },
 		"pathPrefix":   func() string { return opts.ExternalURL.Path },
+		"pageTitle":    func() string { return opts.PageTitle },
 		"buildVersion": func() string { return opts.Version.Revision },
 		"stripLabels": func(lset map[string]string, labels ...string) map[string]string {
 			for _, ln := range labels {