isolateserver: add checkbox to enable ts_mon

appengine/isolate/templates/restricted_config.html

Index: appengine/isolate/templates/restricted_config.html
diff --git a/appengine/isolate/templates/restricted_config.html b/appengine/isolate/templates/restricted_config.html
index 6f220ac58ca70366596fa58ba397246b36af26f0..37aafa529c9235b0d8a48c99a5fe762ea920d060 100644
--- a/appengine/isolate/templates/restricted_config.html
+++ b/appengine/isolate/templates/restricted_config.html
@@ -1,6 +1,15 @@
 {% set title = 'Isolate global config' %}
 {% extends "isolate/base.html" %}
 
+{% block headers %}
+<script>
+function onclick_ts_mon() {
+  document.getElementById("enable_ts_monitoring_hidden").disabled =
+    document.getElementById("enable_ts_monitoring").checked;
+  }
+</script>
+{% endblock %}
+
 {% block body %}
 <h1>Server global config</h1>
 
@@ -24,6 +33,11 @@ Last updated on: <strong>{{cfg.updated_ts|datetimeformat}}</strong>.<br>
     <input type="text" name="default_expiration"
         value="{{cfg.default_expiration}}" size="60" />
   </div>
+  <h2>Timeseries Monitoring</h2>
+  <div>
+   Enable: <input id="enable_ts_monitoring" type="checkbox" name="enable_ts_monitoring" value="True" onclick="onclick_ts_mon()" {% if cfg.enable_ts_monitoring %}checked{% endif %}>
+   <input id="enable_ts_monitoring_hidden" type="hidden" name="enable_ts_monitoring" value="False">
+  </div>
   <h2>Google storage</h2>
   See this <a href="https://developers.google.com/storage/docs/accesscontrol#About-the-Client-ID">
   page</a> for instructions on how to setup Service account for API Access to