The first graph shows the last 7 days of metrics in one go:
This one shows the last 7 days where each span of 24h is represented by a colored line, which allows to compare the values directly - the darker the color, the older the data:
This needs some more work, as the x-axis labeling does not yet take the exact start time into account.
Also time spans that have no values (e.g. because agent is down) should not show a straight line, but no line at all for that period. There should perhaps be a legend about the colors as well.
If anyone is interested to add tooltips for the values or fix the label for the second graph, please ping me.