Add prometheus datasource

public/app/plugins/datasource/prometheus/datasource.js

@@ -1,17 +1,18 @@
 define([
   'angular',
   'lodash',
-  'kbn',
   'moment',
   'app/core/utils/datemath',
   './directives',
   './queryCtrl',
 ],
-function (angular, _, kbn, dateMath) {
+function (angular, _, moment, dateMath) {
   'use strict';
 
   var module = angular.module('grafana.services');
 
+  var durationSplitRegexp = /(\d+)(ms|s|m|h|d|w|M|y)/;
+
   module.factory('PrometheusDatasource', function($q, backendSrv, templateSrv) {
 
     function PrometheusDatasource(datasource) {
@@ -183,13 +184,14 @@ function (angular, _, kbn, dateMath) {
     };
 
     PrometheusDatasource.prototype.calculateInterval = function(interval, intervalFactor) {
-      var sec = kbn.interval_to_seconds(interval);
-
+      var m = interval.match(durationSplitRegexp);
+      var dur = moment.duration(parseInt(m[1]), m[2]);
+      var sec = dur.asSeconds();
       if (sec < 1) {
         sec = 1;
       }
 
-      return sec * intervalFactor;
+      return Math.floor(sec * intervalFactor) + 's';
     };
 
     function transformMetricData(md, options) {

public/app/plugins/datasource/prometheus/queryCtrl.js

@@ -117,7 +117,7 @@ function (angular, _, kbn, dateMath) {
     $scope.calculateInterval = function() {
       var interval = $scope.target.interval || $scope.interval;
       var calculatedInterval = $scope.datasource.calculateInterval(interval, $scope.target.intervalFactor);
-      $scope.target.calculatedInterval = kbn.secondsToHms(calculatedInterval);
+      $scope.target.calculatedInterval = calculatedInterval;
     };
 
     // TODO: validate target

public/test/specs/prometheus-datasource-specs.js

@@ -21,7 +21,7 @@ define([
       var results;
       var urlExpected = '/api/v1/query_range?query=' +
                         encodeURIComponent('test{job="testjob"}') +
-                        '&start=1443438675&end=1443460275&step=60';
+                        '&start=1443438675&end=1443460275&step=60s';
       var query = {
         range: { from: moment(1443438674760), to: moment(1443460274760) },
         targets: [{ expr: 'test{job="testjob"}' }],