ME: Autonomous&Lifecycle-bounded Pool Convergence

Co-Authored-By: brekotis <93345790+brekotis@users.noreply.github.com>

src/transport/middle_proxy/pool_reinit/coordination.rs

@@ -491,7 +491,11 @@ impl MePool {
         rand::rng().random_range(min_ms..=max_ms)
     }
 
-    pub(super) fn hardswap_warmup_backoff_ms(&self, pass_idx: usize) -> u64 {
+    /// Returns capped exponential retry delay with bounded positive jitter.
+    pub(in crate::transport::middle_proxy) fn hardswap_warmup_backoff_ms(
+        &self,
+        pass_idx: usize,
+    ) -> u64 {
         let base_ms = self
             .reinit
             .me_hardswap_warmup_pass_backoff_base_ms

src/transport/middle_proxy/pool_reinit/reconcile.rs

@@ -169,11 +169,21 @@ impl MePool {
         }
     }
 
+    /// Reconciles one immutable endpoint snapshot without draining uncovered groups.
     pub async fn zero_downtime_reinit_after_map_change(
         self: &Arc<Self>,
         rng: &SecureRandom,
     ) -> bool {
         let endpoint_snapshot = self.endpoint_snapshot.load_full();
+        self.reinit_endpoint_snapshot(rng, endpoint_snapshot).await
+    }
+
+    /// Reconciles exactly the revision owned by the scheduler's retry objective.
+    pub(in crate::transport::middle_proxy) async fn reinit_endpoint_snapshot(
+        self: &Arc<Self>,
+        rng: &SecureRandom,
+        endpoint_snapshot: Arc<EndpointSnapshot>,
+    ) -> bool {
         let desired_by_dc = self.desired_dc_endpoints_from_snapshot(&endpoint_snapshot);
         let now_epoch_secs = Self::now_epoch_secs();
         let v4_suppressed = self.is_family_temporarily_suppressed(IpFamily::V4, now_epoch_secs);
@@ -407,6 +417,7 @@ impl MePool {
         true
     }
 
+    /// Applies periodic rotation using the same coverage and generation fences as map changes.
     pub async fn zero_downtime_reinit_periodic(self: &Arc<Self>, rng: &SecureRandom) -> bool {
         self.zero_downtime_reinit_after_map_change(rng).await
     }

src/transport/middle_proxy/pool_reinit/tests.rs

@@ -149,6 +149,7 @@ fn stale_concurrent_attempt_cannot_regress_active_generation() {
         active_generation: 1,
         desired_map_hash: 22,
         endpoint_revision: 7,
+        floor_policy_revision: 1,
         pending: Some(ReinitPendingState {
             generation: 3,
             started_at_epoch_secs: 1,