Use correct field for label name, fix default for unit to be blank

app/assets/javascripts/monitoring/components/monitoring_column.vue

@@ -105,9 +105,9 @@
           this.measurements = measurements.small;
         }
         this.data = query.result[0].values;
-        this.unitOfDisplay = query.unit || 'N/A';
+        this.unitOfDisplay = query.unit || '';
         this.yAxisLabel = this.columnData.y_label || 'Values';
-        this.legendTitle = query.legend || 'Average';
+        this.legendTitle = query.label || 'Average';
         this.graphWidth = this.$refs.baseSvg.clientWidth -
                      this.margin.left - this.margin.right;
         this.graphHeight = this.graphHeight - this.margin.top - this.margin.bottom;