Allow scaling in getEndDateForRPO

RPO can now be scaled to allow a little extra grace in certain
circumstances.

Co-authored-by: Brian Gough <brian.gough@overleaf.com>
GitOrigin-RevId: fa60a9ffe966977e396b5645919ddd1451fb1b7a

services/history-v1/backupVerifier/ProjectMetrics.mjs

@@ -21,15 +21,13 @@ export async function measurePendingChangesBeforeTime(beforeTime) {
 
 /**
  *
- * @param {number} graceSeconds - Number of seconds projects are allowed before they must be backed up.
+ * @param {Date} graceTime
  * @return {Promise<void>}
  */
-export async function measureNeverBackedUpProjects(graceSeconds) {
-  const now = new Date()
-  const startOfGracePeriod = new Date(now - graceSeconds * 1000)
+export async function measureNeverBackedUpProjects(graceTime) {
   const neverBackedUpCount = await projectsCollection.countDocuments({
     'overleaf.backup.lastBackedUpVersion': null,
-    _id: { $lt: objectIdFromDate(startOfGracePeriod) },
+    _id: { $lt: objectIdFromDate(graceTime) },
   })
   Metrics.gauge('backup_verification_never_backed_up', neverBackedUpCount)
 }

services/history-v1/backupVerifier/healthCheck.mjs

@@ -27,6 +27,6 @@ export async function healthCheck() {
     await verifyProjectWithErrorContext(historyId)
   }
 
-  await measurePendingChangesBeforeTime(getEndDateForRPO())
-  await measureNeverBackedUpProjects(RPO)
+  await measurePendingChangesBeforeTime(getEndDateForRPO(2))
+  await measureNeverBackedUpProjects(getEndDateForRPO(2))
 }

services/history-v1/backupVerifier/utils.mjs

@@ -12,10 +12,11 @@ export function objectIdFromDate(time) {
 }
 
 /**
+ * @param {number} [factor] - Multiply RPO by this factor, default is 1
  * @return {Date}
  */
-export function getEndDateForRPO() {
-  return new Date(Date.now() - RPO)
+export function getEndDateForRPO(factor = 1) {
+  return new Date(Date.now() - RPO * factor)
 }
 
 /**