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fix: jitter = actual check start minus ideal scheduled time, not wall clock at dispatch

This commit is contained in:
M1 2026-03-17 10:54:36 +04:00
parent 27be1fa8bf
commit bd3c33dda4
1 changed files with 8 additions and 5 deletions
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13
apps/web/src/routes/internal.ts
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@ -22,11 +22,15 @@ export const internal = new Elysia({ prefix: "/internal", detail: { hide: true }
return {}; return {};
}) })
// Returns monitors that are due for a check, with scheduled_at = now() // Returns monitors that are due for a check.
// scheduled_at = last_checked_at + interval_s (ideal fire time), so jitter = actual_start - scheduled_at
.get("/due", async () => { .get("/due", async () => {
const scheduled_at = new Date().toISOString();
const monitors = await sql` const monitors = await sql`
SELECT m.id, m.url, m.method, m.request_headers, m.request_body, m.timeout_ms, m.interval_s, m.query SELECT m.id, m.url, m.method, m.request_headers, m.request_body, m.timeout_ms, m.interval_s, m.query,
CASE
WHEN last.checked_at IS NULL THEN now()
ELSE last.checked_at + (m.interval_s || ' seconds')::interval
END AS scheduled_at
FROM monitors m FROM monitors m
LEFT JOIN LATERAL ( LEFT JOIN LATERAL (
SELECT checked_at FROM pings SELECT checked_at FROM pings
@ -37,8 +41,7 @@ export const internal = new Elysia({ prefix: "/internal", detail: { hide: true }
AND (last.checked_at IS NULL AND (last.checked_at IS NULL
OR last.checked_at < now() - (m.interval_s || ' seconds')::interval) OR last.checked_at < now() - (m.interval_s || ' seconds')::interval)
`; `;
// Attach scheduled_at to each monitor so the runner can report jitter return monitors;
return monitors.map((m: any) => ({ ...m, scheduled_at }));
}) })
// Manual retention cleanup trigger // Manual retention cleanup trigger