From a415670bc34825cbee8d548bff94abe3630c57fa Mon Sep 17 00:00:00 2001
From: Joonas Koivunen <joonas@neon.tech>
Date: Mon, 3 Apr 2023 14:15:41 +0300
Subject: [PATCH] feat: log evictions (#3930)

this will help log analysis with the counterpart of already logging all
remote download needs and downloads. ended up with a easily regexable
output in the final round.
---
 pageserver/src/tenant/timeline.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pageserver/src/tenant/timeline.rs b/pageserver/src/tenant/timeline.rs
index b40cb05411..e80e32644b 100644
--- a/pageserver/src/tenant/timeline.rs
+++ b/pageserver/src/tenant/timeline.rs
@@ -1127,6 +1127,9 @@ impl Timeline {
                     self.metrics
                         .evictions_with_low_residence_duration
                         .observe(delta);
+                    info!(layer=%local_layer.short_id(), residence_millis=delta.as_millis(), "evicted layer after known residence period");
+                } else {
+                    info!(layer=%local_layer.short_id(), "evicted layer after unknown residence period");
                 }
 
                 true