This topic provides information about understanding full-page charts.
Each bar on a chart represents a timeslice that is 1/60 of the selected metric display range. A chart can plot a maximum of 60 points. The value of the Y-axis at the top of the bar is the observed metric value for that timeslice. What the value represents varies by the nature of the metric:
For a static metric, one whose value does not vary over time (for instance a timestamp), the plotted value corresponds to a single measurement.
For a dynamic metric, one whose value may go up or down over time:
o The plotted point is the average of the values collected over the timeslice that ended at the time shown for the bar in the X-axis. The length of time over which the value was averaged depends on the current metric display range. For a display range of eight hours, each charted point represents the average of the preceding eight-minute period (8 hours / 60 time slices along the X-axis = 8 minutes). If the metric is collected every 60 seconds, and the chart's display range is 60 minutes, each of the 60 plotted points on the graph represents the single, observed value for the metric at a single point in time.
The I-bar superimposed on the vertical bar shows the range of values collected during the timeslice.
• Trends Up and Trends Down
For a cumulative metric, one whose values either always increases or decreases, (such as bytes served, uptime, minimum response time), the plotted point is the maximum (or minimum) value for the time slice. The value shown for a metric that for trends up or down metrics is not the average over the timeslice.
More About Timeslices
Charts are divided into a maximum of 60 slices, where each slice represents the same amount of time, over any display range the user chooses. For example:
If the charted metric's collection interval is 5 minutes and the selected metric display range is one hour, during which the metric value was collected 12 times, the chart will contain 12 time slices, and each slice will represent a single observed metric value.
If the metric display range is 5 hours, during which the metric value was collected 60 times, the chart will display 60 time slices, each will represent a single observed metric value.
If the selected display range is 10 hours long, during which the metric value was collected 120 times, the chart will display 60 timeslices - the maximum - and each bar will summarize the 2 data points collected during the timeslice. For dynamic metrics, data points are averaged. For trends up or down metrics the highest/lowest value is plotted.
Peak, Average, and Low Values
By default, three colored horizontal lines appear on a metric chart that show the peak (pink), average (green) and low (blue) values collected for the metric for duration plotted.
Baseline and Acceptable High and Low Values
In vRealize Hyperic, this additional information may appear on a chart:
Baseline — The baseline value for the metric is shown as a tan horizontal line.
Low Range — A pink horizontal bar appears across the chart, between the low range value and the maximum value shown on the chart's Y-axis.
High Range — A green horizontal bar appears across the chart, between the high range value and the minumum value shown on the chart's Y-axis.