PR for request #562

https://github.com/alexanderzobnin/grafana-zabbix/issues/562

dist/datasource-zabbix/dataProcessor.js

@@ -21,6 +21,24 @@ System.register(['lodash', './utils', './timeseries'], function (_export, _conte
     }
   }
 
+  function removeAboveValue(n, datapoints) {
+    return _.map(datapoints, function (point) {
+      return [point[0] > n ? null : point[0], point[1]];
+    });
+  }
+
+  function removeBelowValue(n, datapoints) {
+    return _.map(datapoints, function (point) {
+      return [point[0] < n ? null : point[0], point[1]];
+    });
+  }
+
+  function transformNull(n, datapoints) {
+    return _.map(datapoints, function (point) {
+      return [point[0] !== null ? point[0] : n, point[1]];
+    });
+  }
+
   function sortSeries(direction, timeseries) {
     return _.orderBy(timeseries, [function (ts) {
       return ts.target.toLowerCase();
@@ -142,6 +160,7 @@ System.register(['lodash', './utils', './timeseries'], function (_export, _conte
         rate: rate,
         movingAverage: simpleMovingAverage,
         exponentialMovingAverage: expMovingAverage,
+        transformNull: transformNull,
         aggregateBy: aggregateByWrapper,
         // Predefined aggs
         percentil: percentil,
@@ -152,6 +171,8 @@ System.register(['lodash', './utils', './timeseries'], function (_export, _conte
         sum: _.partial(aggregateWrapper, SUM),
         count: _.partial(aggregateWrapper, COUNT),
         sumSeries: sumSeries,
+        removeAboveValue: removeAboveValue,
+        removeBelowValue: removeBelowValue,
         top: _.partial(limit, 'top'),
         bottom: _.partial(limit, 'bottom'),
         sortSeries: sortSeries,