trystanj commented on code in PR #586:
URL: 
https://github.com/apache/flink-kubernetes-operator/pull/586#discussion_r1584990017


##########
flink-kubernetes-operator-autoscaler/src/main/java/org/apache/flink/kubernetes/operator/autoscaler/config/AutoScalerOptions.java:
##########
@@ -68,15 +68,16 @@ private static ConfigOptions.OptionBuilder 
autoScalerConfig(String key) {
     public static final ConfigOption<Double> TARGET_UTILIZATION_BOUNDARY =
             autoScalerConfig("target.utilization.boundary")
                     .doubleType()
-                    .defaultValue(0.1)
+                    .defaultValue(0.4)

Review Comment:
   Thanks, that makes a lot of sense! Is catch up status determined by literal 
timestamps compared against the catch up duration? eg if a record was placed in 
kafka 10m ago, and our expected catch up duration is 5m, then are we 5m behind, 
or are we still 10m behind? or is catch up determined by throughput numbers? 
just trying to get a better sense of "catch up" statistics!
   
   Perhaps our problem is that lag, for every single job tracked (operator 1.7, 
Flink 1.18.1, all using `KafkaSource`), is `N/A`. At least according to the 
exposed operator metrics themselves. If the operator can't see the lag then 
maybe it can't make an informed decision? I'm wondering if this is a bug on our 
configuration or maybe I'm just way off base. I should expect to see values for 
`LAG_Current`, right?



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