diff --git a/changelog.d/19399.misc b/changelog.d/19399.misc
new file mode 100644
index 0000000000..0d02904f40
--- /dev/null
+++ b/changelog.d/19399.misc
@@ -0,0 +1 @@
+Update "Event Send Time Quantiles" graph to only use dots for the event persistence rate (Grafana dashboard).
diff --git a/contrib/grafana/synapse.json b/contrib/grafana/synapse.json
index af6c9d7b9e..ceacc10369 100644
--- a/contrib/grafana/synapse.json
+++ b/contrib/grafana/synapse.json
@@ -416,6 +416,10 @@
               {
                 "id": "custom.axisPlacement",
                 "value": "right"
+              },
+              {
+                "id": "custom.fillOpacity",
+                "value": 0
               }
             ]
           },
@@ -443,6 +447,10 @@
               {
                 "id": "custom.axisPlacement",
                 "value": "right"
+              },
+              {
+                "id": "custom.fillOpacity",
+                "value": 0
               }
             ]
           }