fix(metrics): сохранить нулевые медианы процесса (#637)

Issue: #637
User-Visible: no

scripts/process-metrics.mjs

@@ -32,6 +32,10 @@ const median = (values) => {
   const mid = Math.floor(sorted.length / 2);
   return sorted.length % 2 ? sorted[mid] : (sorted[mid - 1] + sorted[mid]) / 2;
 };
+const medianHours = (values) => {
+  const value = median(values);
+  return value === null ? null : hours(value);
+};
 const mean = (values) => {
   const finite = values.filter(Number.isFinite);
   return finite.length ? finite.reduce((a, b) => a + b, 0) / finite.length : null;
@@ -159,10 +163,10 @@ export function buildReport({ since, until, issues = [], timelines = new Map(),
       closed: perIssue.length,
       completed: completed.length,
       notPlanned: perIssue.filter((issue) => issue.stateReason === 'not_planned').length,
-      medianLeadToS7Hours: hours(median(completed.map((i) => i.leadToS7Ms)) ?? NaN) || null,
-      medianReviewToMergeHours: hours(median(completed.map((i) => i.reviewToMergeMs)) ?? NaN) || null,
-      medianLeadToS8Hours: hours(median(completed.map((i) => i.leadToS8Ms)) ?? NaN) || null,
-      medianSpecLeadHours: hours(median(completed.map((i) => i.specLeadMs)) ?? NaN) || null,
+      medianLeadToS7Hours: medianHours(completed.map((i) => i.leadToS7Ms)),
+      medianReviewToMergeHours: medianHours(completed.map((i) => i.reviewToMergeMs)),
+      medianLeadToS8Hours: medianHours(completed.map((i) => i.leadToS8Ms)),
+      medianSpecLeadHours: medianHours(completed.map((i) => i.specLeadMs)),
       codeReviewRounds: { mean: mean(codeRounds), distribution: dist(codeRounds), issues: codeRounds.length },
       specReviewRounds: { mean: mean(specRounds), distribution: dist(specRounds), issues: specRounds.length },
       s7RepeatRequests: completed.filter((i) => i.s7Requests > 1).length,

test/process-metrics.test.mjs

@@ -105,6 +105,29 @@ test('#637 buildReport + renderMarkdown: сводка воспроизводит
   assert.equal(report.jobs, null, 'без jobs job-минуты не выдумываются');
 });
 
+test('#637 buildReport: нулевая медиана не смешивается с отсутствием данных', () => {
+  const issue = { number: 637, title: 'fast', closed_at: T(4 / 60), state_reason: 'completed' };
+  const timelines = new Map([[637, [
+    labeled('S1-new', 0),
+    labeled('S4-spec-review', 0),
+    labeled('S5-ready', 1 / 60),
+    labeled('S7-code-review', 2 / 60),
+    labeled('S8-merged', 3 / 60),
+  ]] ]);
+  const report = buildReport({ since: T(0), until: T(1), issues: [issue], timelines });
+  assert.deepEqual([
+    report.issues.medianLeadToS7Hours,
+    report.issues.medianReviewToMergeHours,
+    report.issues.medianLeadToS8Hours,
+    report.issues.medianSpecLeadHours,
+  ], [0, 0, 0.1, 0]);
+  assert.match(renderMarkdown(report), /Медиана вход → S7 \| 0 ч/);
+
+  const empty = buildReport({ since: T(0), until: T(1) });
+  assert.equal(empty.issues.medianLeadToS7Hours, null);
+  assert.match(renderMarkdown(empty), /Медиана вход → S7 \| —/);
+});
+
 test('#637 workflow: еженедельный запуск читает только, публикует summary и artifact', () => {
   const wf = readFileSync(new URL('../.github/workflows/process-metrics.yml', import.meta.url), 'utf8');
   assert.match(wf, /schedule:\n(?:\s+#[^\n]*\n)*\s+- cron: '/);