7-day graph shows incorrect scale for the y-axis

[hlumca]

I am monitoring a floating point item every 10 minutes. In the 7-day graph, the max value at the bottom shows 22s 970.32ms. The y-axis on the left side only goes up to 8s. When I switch to the 3-day graph, the y-axis goes up to 30s. In the 3-day graph, it looks like every 10-minute sample is plotted. When I switch to the 4-day graph, it looks like there is a plot point only once per hour. Is this a bug in how the graphs are displayed?

[cyber]

longer period graphs are plotted based on trends, not on every single value from that period... trend is a record that stores min,max,avg values for one hour period.
Your monitor may not have enough pixels to draw a graph with every value..