Include current hour/day in Metric monitor Group data

Previously, metric monitors required you to ignore the current hour or day's worth of data. This helped to ensure that the data was mature and ready for anomaly detection before the monitor sampled it. However, this sometimes led to unnecessarily long time-to-detection for issues. For example, if today's data loaded at 7am, this release makes it possible to check that data shortly thereafter (i.e. 7:30am) instead of waiting until the following day.