e-check-interval</code> is the interval for Citadel health checking.
The <code>interval</code> is the maximum time elapsed since the last update of the health status file, for the prober to consider
Citadel as healthy.
<code>initialDelaySeconds</code> and <code>periodSeconds</code> are the initial delay and the probe running period.</p><p>Prolonging <code>probe-check-interval</code> will reduce the health checking overhead, but there will be a greater lagging for the
prober to get notified on the unhealthy 