feat(rum-explorer): display conversion rate per facet entry

tools/rum/elements/list-facet.js

@@ -1,4 +1,6 @@
-import { scoreCWV, toHumanReadable, escapeHTML } from '../utils.js';
+import {
+  computeConversionRate, escapeHTML, scoreCWV, toHumanReadable,
+} from '../utils.js';
 import { pValue } from '../cruncher.js';
 
 async function addSignificanceFlag(element, metric, baseline) {
@@ -210,7 +212,17 @@ export default class ListFacet extends HTMLElement {
           countspan.textContent = toHumanReadable(entry.metrics.pageViews.sum);
           countspan.title = entry.metrics.pageViews.sum;
           const valuespan = this.createValueSpan(entry);
-          label.append(valuespan, countspan);
+
+          const conversionspan = document.createElement('span');
+          conversionspan.className = 'extra';
+
+          const conversions = entry.metrics.conversions.sum;
+          const visits = entry.metrics.visits.sum;
+          const conversionRate = computeConversionRate(conversions, visits);
+          conversionspan.textContent = toHumanReadable(conversionRate);
+          conversionspan.title = conversionRate;
+
+          label.append(valuespan, countspan, conversionspan);
 
           const ul = document.createElement('ul');
           ul.classList.add('cwv');

tools/rum/rum-slicer.css

@@ -200,8 +200,8 @@ main .key-metrics ul > #visits p span.extra::after {
 
 conversion-tracker {
   display: grid;
-  grid-template-areas: 
-  'heading heading button' 
+  grid-template-areas:
+  'heading heading button'
   'number empty button'
   'number definition definition'
   ;
@@ -383,8 +383,8 @@ figcaption > span {
   background-color: var(--light-purple);
 }
 
-.filter-tags > span.filter-tag-lcp, 
-.filter-tags > span.filter-tag-cls, 
+.filter-tags > span.filter-tag-lcp,
+.filter-tags > span.filter-tag-cls,
 .filter-tags > span.filter-tag-inp,
 .filter-tags > span.filter-tag-conversions,
 .filter-tags > span.filter-tag-visits {
@@ -568,15 +568,17 @@ vitals-facet label::before {
   word-break: break-all;
 }
 
-#facets fieldset label span.count {
+#facets fieldset label span.count, #facets fieldset label span.extra {
   opacity: 0.6;
 }
 
-#facets fieldset div:hover span.count {
+#facets fieldset div:hover span.count, #facets fieldset div:hover span.extra {
   opacity: 1;
 }
 
-#facets fieldset label span.count::before, #facets fieldset label span.value::before {
+#facets fieldset label span.count::before,
+#facets fieldset label span.value::before,
+#facets fieldset label span.extra::before {
   content: ' (';
 }
 
@@ -588,6 +590,19 @@ vitals-facet label::before {
   content: ')';
 }
 
+#facets fieldset label span.extra::after {
+  content: '%)';
+}
+
+#facets fieldset span.interesting {
+    background: orange;
+}
+
+#facets fieldset span.significant {
+    background: red;
+}
+
+
 #facets literal-facet label span.value::after {
   content: '';
 }
@@ -615,7 +630,7 @@ thumbnail-facet fieldset div:not(.more-container) {
 
 vitals-facet fieldset {
   display: grid;
-  grid-template-areas: 
+  grid-template-areas:
   '. lcp-good cls-good inp-good'
   '. lcp-ni cls-ni inp-ni'
   '. lcp-poor cls-poor inp-poor';
@@ -759,7 +774,7 @@ vitals-facet fieldset label {
 }
 
 #facets fieldset div.load-more {
-  grid-column: 2 / span 2;  
+  grid-column: 2 / span 2;
   display: block;
   padding: 10px 0;
 }
@@ -994,18 +1009,18 @@ facet-sidebar[aria-disabled="true"] div.quick-filter {
   main .key-metrics ul > * h2, main .key-metrics ul > * button {
     font-size: 14px;
   }
-  
+
   main .key-metrics ul > * h2::before {
     width: 14px;
     height: 14px;
     border-radius: 14px;
   }
-  
+
   main .key-metrics ul > * p {
     font-size: 30px;
     margin: 16px 0;
   }
-  
+
   main .key-metrics ul {
     grid-gap: 16px;
   }
@@ -1031,7 +1046,7 @@ facet-sidebar[aria-disabled="true"] div.quick-filter {
     border-radius: 16px;
     padding: 4px 16px;
     font-size: 18px;
-  }  
+  }
 
   #facets link-facet  a .protocol {
     display: inline;
@@ -1054,7 +1069,7 @@ facet-sidebar[aria-disabled="true"] div.quick-filter {
 
   main .key-metrics ul {
     grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
-  }  
+  }
 
   #deepmain > div, #deepmain > facet-sidebar {
     width: 50%;
@@ -1095,7 +1110,7 @@ facet-sidebar[aria-disabled="true"] div.quick-filter {
 @media (min-width: 2000px) {
   main .key-metrics ul {
     grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
-  }  
+  }
 
   #facets link-facet  a .protocol {
     display: inline;
@@ -1108,4 +1123,4 @@ facet-sidebar[aria-disabled="true"] div.quick-filter {
 
 footer.footer-wrapper.appear {
   display: none;
-}
+}

tools/rum/slicer.js

@@ -2,7 +2,12 @@
 import { DataChunks } from './cruncher.js';
 import DataLoader from './loader.js';
 import {
-  parseConversionSpec, parseSearchParams, isKnownFacet, scoreCWV, toHumanReadable,
+  parseConversionSpec,
+  parseSearchParams,
+  isKnownFacet,
+  scoreCWV,
+  toHumanReadable,
+  computeConversionRate,
 } from './utils.js';
 
 /* globals */
@@ -36,7 +41,9 @@ dataChunks.addSeries('lcp', (bundle) => bundle.cwvLCP);
 dataChunks.addSeries('cls', (bundle) => bundle.cwvCLS);
 dataChunks.addSeries('inp', (bundle) => bundle.cwvINP);
 dataChunks.addSeries('ttfb', (bundle) => bundle.cwvTTFB);
-
+dataChunks.addSeries('conversions', (bundle) => (dataChunks.hasConversion(bundle, parseConversionSpec())
+  ? bundle.weight
+  : 0));
 function setDomain(domain, key) {
   DOMAIN = domain;
   loader.domain = domain;
@@ -59,8 +66,8 @@ export function updateKeyMetrics(keyMetrics) {
 
   document.querySelector('#conversions p').textContent = toHumanReadable(keyMetrics.conversions);
   const conversionsExtra = document.createElement('span');
-  conversionsExtra.textContent = toHumanReadable((
-    100 * keyMetrics.conversions) / keyMetrics.pageViews);
+  const conversionRate = computeConversionRate(keyMetrics.conversions, keyMetrics.visits);
+  conversionsExtra.textContent = toHumanReadable(conversionRate);
   conversionsExtra.className = 'extra';
   document.querySelector('#conversions p').appendChild(conversionsExtra);
 
@@ -222,16 +229,13 @@ export async function draw() {
 
   await herochart.draw();
 
-  const facets = dataChunks.facets.conversions;
-  const converted = facets?.find((f) => f.value === 'converted');
-
   updateKeyMetrics({
     pageViews: dataChunks.totals.pageViews.sum,
     lcp: dataChunks.totals.lcp.percentile(75),
     cls: dataChunks.totals.cls.percentile(75),
     inp: dataChunks.totals.inp.percentile(75),
     ttfb: dataChunks.totals.ttfb.percentile(75),
-    conversions: converted ? converted.weight : 0,
+    conversions: dataChunks.totals.conversions.sum,
     visits: dataChunks.totals.visits.sum,
     bounces: dataChunks.totals.bounces.sum,
   });

tools/rum/test/utils.test.js

@@ -1,6 +1,6 @@
 import { describe, it } from 'node:test';
 import assert from 'node:assert/strict';
-import { truncate, escapeHTML } from '../utils.js';
+import { truncate, escapeHTML, computeConversionRate } from '../utils.js';
 
 describe('truncate', () => {
   it('truncates to the beginning of the hour', () => {
@@ -46,3 +46,30 @@ describe('escapeHTML', () => {
     assert.strictEqual(escapeHTML('<div>hello</div>'), '&#60;div&#62;hello&#60;/div&#62;');
   });
 });
+
+describe('computeConversionRate', () => {
+  it('its 10% for 1 conversion and 10 visits', () => {
+    const result = computeConversionRate(1, 10);
+    assert.strictEqual(result, 10);
+  });
+  it('its 100% for 10 conversion and 10 visits', () => {
+    const result = computeConversionRate(10, 10);
+    assert.strictEqual(result, 100);
+  });
+  it('its 0% for 0 conversion and 10 visits', () => {
+    const result = computeConversionRate(0, 10);
+    assert.strictEqual(result, 0);
+  });
+  it('its 100% for 1 conversion and 0 visits', () => {
+    const result = computeConversionRate(1, 0);
+    assert.strictEqual(result, 100);
+  });
+  it('its 0% for 0 conversion and 0 visits', () => {
+    const result = computeConversionRate(0, 0);
+    assert.strictEqual(result, 100);
+  });
+  it('its 100% for 2 conversion and 1 visits', () => {
+    const result = computeConversionRate(0, 0);
+    assert.strictEqual(result, 100);
+  });
+});

tools/rum/utils.js

@@ -201,3 +201,18 @@ export function parseConversionSpec() {
   const filter = ([key]) => (key.startsWith('conversion.'));
   return parseSearchParams(params, filter, transform);
 }
+
+/**
+ * Conversion rates are computed as the ratio of conversions to visits. The conversion rate is
+ * capped at 100%.
+ * @param conversions the number of conversions
+ * @param visits the number of visits
+ * @returns {number}  the conversion rate as a percentage
+ */
+export function computeConversionRate(conversions, visits) {
+  const conversionRate = (100 * conversions) / visits;
+  if (conversionRate >= 0 && conversionRate <= 100) {
+    return conversionRate;
+  }
+  return 100;
+}