@Override
    public Throwable fillInStackTrace() {
        if (Flags.verboseExceptionSampler().isSampled(getClass())) {
            return super.fillInStackTrace();
        }
        return this;
    }
Creates a new instance with the specified {@code message}, {@code cause}, suppression enabled or
disabled, and writable stack trace enabled or disabled.
saml/src/main/java/com/linecorp/armeria/server/saml/SamlException.java