DRILL-4286 Web UI index page is constantly refreshed to get up-to-date drillbits status. When graceperiod is set to 0, it is refreshed at high pace because refresh time is counted as gracepeiod / 3. Sometimes I saw the insufficient resources error (insufficient_resources.JPG).
Also graceperiod should be in camel case.
use default (10 seconds) if grace period is set to 0.