Add Knative metrics to Prometheus

1 files changed, 146 insertions, 0 deletions

diff --git a/app/assets/javascripts/serverless/components/area.vue b/app/assets/javascripts/serverless/components/area.vue
new file mode 100644
index 00000000000..32c9d6eccb8
--- /dev/null
+++ b/app/assets/javascripts/serverless/components/area.vue
@@ -0,0 +1,146 @@
+<script>
+import { GlAreaChart } from '@gitlab/ui/dist/charts';
+import { debounceByAnimationFrame } from '~/lib/utils/common_utils';
+import dateFormat from 'dateformat';
+import { X_INTERVAL } from '../constants';
+import { validateGraphData } from '../utils';
+
+let debouncedResize;
+
+export default {
+  components: {
+    GlAreaChart,
+  },
+  inheritAttrs: false,
+  props: {
+    graphData: {
+      type: Object,
+      required: true,
+      validator: validateGraphData,
+    },
+    containerWidth: {
+      type: Number,
+      required: true,
+    },
+  },
+  data() {
+    return {
+      tooltipPopoverTitle: '',
+      tooltipPopoverContent: '',
+      width: this.containerWidth,
+    };
+  },
+  computed: {
+    chartData() {
+      return this.graphData.queries.reduce((accumulator, query) => {
+        accumulator[query.unit] = query.result.reduce((acc, res) => acc.concat(res.values), []);
+        return accumulator;
+      }, {});
+    },
+    extractTimeData() {
+      return this.chartData.requests.map(data => data.time);
+    },
+    generateSeries() {
+      return {
+        name: 'Invocations',
+        type: 'line',
+        data: this.chartData.requests.map(data => [data.time, data.value]),
+        symbolSize: 0,
+      };
+    },
+    getInterval() {
+      const { result } = this.graphData.queries[0];
+
+      if (result.length === 0) {
+        return 1;
+      }
+
+      const split = result[0].values.reduce(
+        (acc, pair) => (pair.value > acc ? pair.value : acc),
+        1,
+      );
+
+      return split < X_INTERVAL ? split : X_INTERVAL;
+    },
+    chartOptions() {
+      return {
+        xAxis: {
+          name: 'time',
+          type: 'time',
+          axisLabel: {
+            formatter: date => dateFormat(date, 'h:MM TT'),
+          },
+          data: this.extractTimeData,
+          nameTextStyle: {
+            padding: [18, 0, 0, 0],
+          },
+        },
+        yAxis: {
+          name: this.yAxisLabel,
+          nameTextStyle: {
+            padding: [0, 0, 36, 0],
+          },
+          splitNumber: this.getInterval,
+        },
+        legend: {
+          formatter: this.xAxisLabel,
+        },
+        series: this.generateSeries,
+      };
+    },
+    xAxisLabel() {
+      return this.graphData.queries.map(query => query.label).join(', ');
+    },
+    yAxisLabel() {
+      const [query] = this.graphData.queries;
+      return `${this.graphData.y_label} (${query.unit})`;
+    },
+  },
+  watch: {
+    containerWidth: 'onResize',
+  },
+  beforeDestroy() {
+    window.removeEventListener('resize', debouncedResize);
+  },
+  created() {
+    debouncedResize = debounceByAnimationFrame(this.onResize);
+    window.addEventListener('resize', debouncedResize);
+  },
+  methods: {
+    formatTooltipText(params) {
+      const [seriesData] = params.seriesData;
+      this.tooltipPopoverTitle = dateFormat(params.value, 'dd mmm yyyy, h:MMTT');
+      this.tooltipPopoverContent = `${this.yAxisLabel}: ${seriesData.value[1]}`;
+    },
+    onResize() {
+      const { width } = this.$refs.areaChart.$el.getBoundingClientRect();
+      this.width = width;
+    },
+  },
+};
+</script>
+
+<template>
+  <div class="prometheus-graph">
+    <div class="prometheus-graph-header">
+      <h5 ref="graphTitle" class="prometheus-graph-title">{{ graphData.title }}</h5>
+      <div ref="graphWidgets" class="prometheus-graph-widgets"><slot></slot></div>
+    </div>
+    <gl-area-chart
+      ref="areaChart"
+      v-bind="$attrs"
+      :data="[]"
+      :option="chartOptions"
+      :format-tooltip-text="formatTooltipText"
+      :width="width"
+      :include-legend-avg-max="false"
+    >
+      <template slot="tooltipTitle">
+        {{ tooltipPopoverTitle }}
+      </template>
+      <template slot="tooltipContent">
+        {{ tooltipPopoverContent }}
+      </template>
+    </gl-area-chart>
+  </div>
+</template>