Symptom:
Health and Performance Monitor Monitoring view :  inability to create Health graphs of more than 7 days for devices

Conditions:
CSM Health and Performance Monitor is enabled and devices are sending logs to CSM.

Device Health Graphs - This section provides a ?snapshot? of device status using graphic displays for certain metrics such as CPU and memory usage. It also presents device-specific traffic information, for example, average number of connections and number of translations for firewall devices (over the most-recent polling period), and average inspection load and percentage of missed packets for IPS sensors (over the most-recent polling period).

Currently we can specify the time frame (Last 1 hour, Last 24 hours, or Last 7 days) to use for these graphs from the Time Frame list. You can focus in on a specific time frame by using the slider bar above the graphs.