'Push Errors', queries.xdsErrors, |||
          Number of push errors. Many of these are at least potentional fatal and should be explored in-depth via Istiod logs.
          Note: metrics here do not use rate() to avoid missing transition from "No series"; series are not reported if there are no errors at all.
        |||
      ),
      panels.heatmap.base(
        'Push Time', queries.pushTime, |||

        private
        var mode: TrackerMode = Initial()

        private
        inline fun <T : TrackerMode> setMode(transition: (TrackerMode) -> T): T {
            synchronized(this) {
                val newMode = transition(mode)
                mode = newMode
                return newMode
            }
        }

	logger.LogOnceIf(ctx, "internal", err, id, errKind...)
}

func transitionLogIf(ctx context.Context, err error, errKind ...interface{}) {
	logger.LogIf(ctx, "transition", err, errKind...)
}

func configLogIf(ctx context.Context, err error, errKind ...interface{}) {
	logger.LogIf(ctx, "config", err, errKind...)
}