Betterer: Expose results as JSON (#81352)

* Expose betterer results as JSON

* Make prettier and add command

* Add aggregation

* Add json generation to lefthook

* Use relative path

* Add grafanabot as codeowner

* Fix parameter type

* Include changes to results

* Run betterer:json

scripts/cli/bettererResultsToJson.ts

@@ -0,0 +1,42 @@
+import { BettererFileIssue, betterer } from '@betterer/betterer';
+import { writeFile } from 'fs/promises';
+
+interface Issue {
+  message: string;
+  count: string;
+}
+
+type ResultMap = Record<string, Record<string, Issue[]>>;
+
+/**
+ *  Produces a JSON file for consumption directly in Grafana
+ */
+async function main() {
+  const results = await betterer.results();
+  const resultMap: ResultMap = {};
+
+  for (const suite of results.resultSummaries) {
+    resultMap[suite.name] = {};
+
+    // Aggregate issues for each file in the suite
+    for (const [file, details] of Object.entries(suite.details)) {
+      const fileIssues: Issue[] = [];
+      for (const issue of details) {
+        const issueExists = fileIssues.find((i) => i.message === issue.message)!!;
+        if (issueExists) {
+          continue;
+        }
+        fileIssues.push({
+          message: issue.message,
+          count: details.filter((i: BettererFileIssue) => i.message === issue.message).length,
+        });
+      }
+      const relativePath = file.replace(process.cwd(), '');
+      resultMap[suite.name][relativePath] = fileIssues;
+    }
+  }
+
+  await writeFile('.betterer.results.json', JSON.stringify(resultMap, undefined, 2));
+}
+
+main().catch(console.error);