From 2819162809c358afccdeb09e07e2c9c7892b1988 Mon Sep 17 00:00:00 2001
From: Alexander Zobnin <alexanderzobnin@gmail.com>
Date: Fri, 29 Jan 2016 16:58:28 +0300
Subject: [PATCH] Added medianBy() aggregation.

---
 plugins/datasource-zabbix/dataProcessingService.js | 12 ++++++++++++
 plugins/datasource-zabbix/metricFunctions.js       | 11 ++++++++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/plugins/datasource-zabbix/dataProcessingService.js b/plugins/datasource-zabbix/dataProcessingService.js
index c941f7e..9adb408 100644
--- a/plugins/datasource-zabbix/dataProcessingService.js
+++ b/plugins/datasource-zabbix/dataProcessingService.js
@@ -190,6 +190,11 @@ function (angular, _, moment, utils) {
       return nearestLeft;
     }
 
+    this.medianBy = function(interval, timeseries) {
+      var flatten_series = _.flatten(timeseries, true);
+      return self.groupBy(interval, self.MEDIAN, flatten_series);
+    };
+
     this.AVERAGE = function(values) {
       var sum = 0;
       _.each(values, function(value) {
@@ -206,6 +211,11 @@ function (angular, _, moment, utils) {
       return _.max(values);
     };
 
+    this.MEDIAN = function(values) {
+      var sorted = _.sortBy(values);
+      return sorted[Math.floor(sorted.length / 2)];
+    };
+
     this.setAlias = function(alias, timeseries) {
       timeseries.target = alias;
       return timeseries;
@@ -215,6 +225,7 @@ function (angular, _, moment, utils) {
       avg: this.AVERAGE,
       min: this.MIN,
       max: this.MAX,
+      median: this.MEDIAN
     };
 
     this.groupByWrapper = function(interval, groupFunc, datapoints) {
@@ -233,6 +244,7 @@ function (angular, _, moment, utils) {
       min: _.partial(this.aggregateWrapper, this.MIN),
       max: _.partial(this.aggregateWrapper, this.MAX),
       sumSeries: this.sumSeries,
+      medianBy: this.medianBy,
       setAlias: this.setAlias,
     };
 
diff --git a/plugins/datasource-zabbix/metricFunctions.js b/plugins/datasource-zabbix/metricFunctions.js
index e5d8ffd..da68293 100644
--- a/plugins/datasource-zabbix/metricFunctions.js
+++ b/plugins/datasource-zabbix/metricFunctions.js
@@ -28,7 +28,7 @@ function (_, $) {
     category: 'Transform',
     params: [
       { name: 'interval', type: 'string'},
-      { name: 'function', type: 'string', options: ['avg', 'min', 'max'] }
+      { name: 'function', type: 'string', options: ['avg', 'min', 'max', 'median'] }
     ],
     defaultParams: ['1m', 'avg'],
   });
@@ -40,6 +40,15 @@ function (_, $) {
     defaultParams: [],
   });
 
+  addFuncDef({
+    name: 'medianBy',
+    category: 'Aggregate',
+    params: [
+      { name: 'interval', type: 'string'}
+    ],
+    defaultParams: ['1m'],
+  });
+
   addFuncDef({
     name: 'average',
     category: 'Aggregate',