Sensible metric capture, even simple GC logging, will typically show issues fairly readily. They will also continue to demonstrate whether all is well for the lifetime of your software.
A similar smell, in my experience, is setting GC parameters at all (logging aside). A reasonably well designed and written app will typically be pretty amenable to GC ergonomics. YMMV, but I've seen these properties used most often in an attempt to keep a struggling JVM on its feet.
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