From 39b85cc6fdfad8d7df27282f5a5fc0f042d9a0e2 Mon Sep 17 00:00:00 2001
From: Joonas Koivunen <joonas@neon.tech>
Date: Thu, 24 Aug 2023 17:03:18 +0300
Subject: [PATCH] layere: record residency changes with download/evict

---
 pageserver/src/tenant/storage_layer.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pageserver/src/tenant/storage_layer.rs b/pageserver/src/tenant/storage_layer.rs
index 81f9e8ec13..54aceb6a34 100644
--- a/pageserver/src/tenant/storage_layer.rs
+++ b/pageserver/src/tenant/storage_layer.rs
@@ -984,6 +984,11 @@ impl LayerE {
                 kind: tokio::sync::OnceCell::default(),
             });
 
+            self.access_stats.record_residence_event(
+                LayerResidenceStatus::Resident,
+                LayerResidenceEventReason::ResidenceChange,
+            );
+
             Ok(if self.wanted_evicted.load(Ordering::Acquire) {
                 // because we reset wanted_evictness earlier, this most likely means when we were downloading someone
                 // wanted to evict this layer.
@@ -1156,6 +1161,8 @@ impl LayerE {
 
                     let res = capture_mtime_and_delete.await;
 
+                    this.access_stats.record_residence_event(LayerResidenceStatus::Evicted, LayerResidenceEventReason::ResidenceChange);
+
                     drop(this.status.send(Status::Evicted));
 
                     match res {