Unexpected config change: Lower log level and add explanation

1 files changed, 3 insertions, 2 deletions

diff --git a/config/src/main/java/com/yahoo/config/subscription/impl/ConfigSubscription.java b/config/src/main/java/com/yahoo/config/subscription/impl/ConfigSubscription.java
index caa11b211ac..46961b2ffc3 100644
--- a/config/src/main/java/com/yahoo/config/subscription/impl/ConfigSubscription.java
+++ b/config/src/main/java/com/yahoo/config/subscription/impl/ConfigSubscription.java
@@ -204,9 +204,10 @@ public abstract class ConfigSubscription<T extends ConfigInstance> {
         if (previousConfig != null && configChanged) {
             SnippetGenerator generator = new SnippetGenerator();
             int sizeHint = 500;
-            log.log(Level.WARNING, "Config has changed unexpectedly for " + key + ", generation " + generation +
+            log.log(Level.INFO, "Config has changed unexpectedly for " + key + ", generation " + generation +
                     ", config in state :" + generator.makeSnippet(previousConfig.toString(), sizeHint) + ", new config: " +
-                    generator.makeSnippet(config.toString(), sizeHint));
+                    generator.makeSnippet(config.toString(), sizeHint) +
+                    ". This might happen if a feature flag is changed when upgrading config servers (either in code or with overrides)");
         }
         this.config.set(new ConfigState<>(true, generation, applyOnRestart, configChanged, config, payloadChecksums));
     }