Added nPercentile and keepLastValue

src/app/services/graphite/gfunc.js

@@ -50,6 +50,13 @@ function (_) {
     defaultParams: [3]
   });
 
+  addFuncDef({
+    name: "nPercentile",
+    category: categories.Calculate,
+    params: [ { name: "Nth percentile", type: 'int' } ],
+    defaultParams: [95]
+  });
+
   addFuncDef({
     name: 'sumSeries',
     shortName: 'sum',
@@ -163,6 +170,11 @@ function (_) {
     category: categories.Special,
   });
 
+  addFuncDef({
+    name: 'keepLastValue',
+    category: categories.Special,
+  });
+
   addFuncDef({
     name: 'scale',
     category: categories.Transform,