(prometheus) support instant query for table format, use checkbox to switch query type

public/app/plugins/datasource/prometheus/datasource.ts

@@ -100,7 +100,7 @@ export class PrometheusDatasource {
       var query: any = {};
       query.expr = this.templateSrv.replace(target.expr, options.scopedVars, self.interpolateQueryExpr);
       query.requestId = options.panelId + target.refId;
-      query.format = target.format;
+      query.instant = target.instant;
 
       var interval = this.templateSrv.replace(target.interval, options.scopedVars) || options.interval;
       var intervalFactor = target.intervalFactor || 1;
@@ -116,7 +116,7 @@ export class PrometheusDatasource {
     }
 
     var allQueryPromise = _.map(queries, query => {
-      if (query.format === 'time_series') {
+      if (!query.instant) {
         return this.performTimeSeriesQuery(query, start, end);
       } else {
         return this.performInstantQuery(query, end);
@@ -333,6 +333,9 @@ export class PrometheusDatasource {
 
     // Populate rows, set value to empty string when label not present.
     _.each(md, function(series) {
+      if (series.value) {
+        series.values = [series.value];
+      }
       if (series.values) {
         for (i = 0; i < series.values.length; i++) {
           var values = series.values[i];

public/app/plugins/datasource/prometheus/partials/query.editor.html

@@ -45,6 +45,8 @@
 			<div class="gf-form-select-wrapper width-8">
 				<select class="gf-form-input gf-size-auto" ng-model="ctrl.target.format" ng-options="f.value as f.text for f in ctrl.formats" ng-change="ctrl.refresh()"></select>
 			</div>
+			<gf-form-switch class="gf-form" label="Instant" label-class="width-5" checked="ctrl.target.instant" on-change="ctrl.refresh()">
+			</gf-form-switch>
 			<label class="gf-form-label">
 				<a href="{{ctrl.linkToPrometheus}}" target="_blank" bs-tooltip="'Link to Graph in Prometheus'">
 					<i class="fa fa-share-square-o"></i>

public/app/plugins/datasource/prometheus/query_ctrl.ts

@@ -14,6 +14,7 @@ class PrometheusQueryCtrl extends QueryCtrl {
   metric: any;
   resolutions: any;
   formats: any;
+  instant: any;
   oldTarget: any;
   suggestMetrics: any;
   getMetricsAutocomplete: any;
@@ -36,9 +37,10 @@ class PrometheusQueryCtrl extends QueryCtrl {
     this.formats = [
       {text: 'Time series', value: 'time_series'},
       {text: 'Table', value: 'table'},
-      {text: 'Instant', value: 'instant'},
     ];
 
+    this.instant = false;
+
     this.updateLink();
   }
 

public/app/plugins/datasource/prometheus/specs/datasource_specs.ts

@@ -119,14 +119,14 @@ describe('PrometheusDatasource', function() {
       expect(results.data[1].datapoints[3][0]).to.be(null);
     });
   });
-  describe('When querying prometheus with one target and format = instant', function () {
+  describe('When querying prometheus with one target and instant = true', function () {
     var results;
     var urlExpected = 'proxied/api/v1/query?query=' +
       encodeURIComponent('test{job="testjob"}') +
       '&time=1443460275';
     var query = {
       range: { from: moment(1443438674760), to: moment(1443460274760) },
-      targets: [{ expr: 'test{job="testjob"}', format: 'instant' }],
+      targets: [{ expr: 'test{job="testjob"}', format: 'time_series', instant: true }],
       interval: '60s'
     };
     var response = {
@@ -228,4 +228,45 @@ describe('PrometheusDatasource', function() {
       );
     });
   });
+  describe('When resultFormat is table and instant = true', function() {
+    var results;
+    var urlExpected = 'proxied/api/v1/query?query=' +
+      encodeURIComponent('test{job="testjob"}') +
+      '&time=1443460275';
+    var query = {
+      range: { from: moment(1443438674760), to: moment(1443460274760) },
+      targets: [{ expr: 'test{job="testjob"}', format: 'time_series', instant: true }],
+      interval: '60s'
+    };
+    var response = {
+      status: "success",
+      data: {
+        resultType: "vector",
+        result: [{
+          metric: { "__name__": "test", job: "testjob" },
+          value: [1443454528, "3846"]
+        }]
+      }
+    };
+    beforeEach(function () {
+      ctx.$httpBackend.expect('GET', urlExpected).respond(response);
+      ctx.ds.query(query).then(function (data) { results = data; });
+      ctx.$httpBackend.flush();
+    });
+    it('should return table model', function() {
+      var table = ctx.ds.transformMetricDataToTable(response.data.result);
+      expect(table.type).to.be('table');
+      expect(table.rows).to.eql(
+        [
+          [ 1443454528000, 'test', 'testjob', 3846]
+        ]);
+      expect(table.columns).to.eql(
+        [ { text: 'Time', type: 'time' },
+          { text: '__name__' },
+          { text: 'job' },
+          { text: 'Value' }
+        ]
+      );
+    });
+  });
 });