From c6d27fb7d55bb6774b116f077bec5076ed1a8ebd Mon Sep 17 00:00:00 2001
From: David Robertson <davidr@element.io>
Date: Wed, 22 Sep 2021 14:13:48 +0100
Subject: [PATCH 1/2] Break down cache expiry reasons in grafana

A follow-up to #10829
---
 contrib/grafana/synapse.json | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/contrib/grafana/synapse.json b/contrib/grafana/synapse.json
index ed1e8ba7f8b6..2c839c30d036 100644
--- a/contrib/grafana/synapse.json
+++ b/contrib/grafana/synapse.json
@@ -6785,7 +6785,7 @@
               "expr": "rate(synapse_util_caches_cache:evicted_size{instance=\"$instance\",job=~\"$job\",index=~\"$index\"}[$bucket_size])",
               "format": "time_series",
               "intervalFactor": 1,
-              "legendFormat": "{{name}} {{job}}-{{index}}",
+              "legendFormat": "{{name}} ({{reason}}) {{job}}-{{index}}",
               "refId": "A"
             }
           ],
@@ -10888,5 +10888,5 @@
   "timezone": "",
   "title": "Synapse",
   "uid": "000000012",
-  "version": 99
+  "version": 100
 }
\ No newline at end of file

From 74647d9b22d472262efd790260d904e05529ecfc Mon Sep 17 00:00:00 2001
From: David Robertson <davidr@element.io>
Date: Wed, 22 Sep 2021 14:24:31 +0100
Subject: [PATCH 2/2] Changelog

---
 changelog.d/10880.misc | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 changelog.d/10880.misc

diff --git a/changelog.d/10880.misc b/changelog.d/10880.misc
new file mode 100644
index 000000000000..5f58d6198c68
--- /dev/null
+++ b/changelog.d/10880.misc
@@ -0,0 +1 @@
+Break down Grafana's cache expiry time series based on reason for eviction---see #10829.
\ No newline at end of file