adding monkeytype

backend/src/jobs/log-collection-sizes.ts

@@ -0,0 +1,27 @@
+import { CronJob } from "cron";
+import * as db from "../init/db";
+import * as Prometheus from "../utils/prometheus";
+
+const CRON_SCHEDULE = "0 */5 * * * *";
+
+const collectionsToLog = [
+  "ape-keys",
+  "configs",
+  "errors",
+  "logs",
+  "presets",
+  "reports",
+  "results",
+  "users",
+];
+
+async function main(): Promise<void> {
+  await Promise.all(collectionsToLog.map(set));
+}
+
+async function set(collection: string): Promise<void> {
+  const size = await db.collection(collection).estimatedDocumentCount();
+  Prometheus.setCollectionSize(collection, size);
+}
+
+export default new CronJob(CRON_SCHEDULE, main);