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The interface chart displays recent data correctly, but for older data, you see only dots instead of a line.
NPM 10.7 or later
This is caused by hourly data older than 30 days, which are not available anymore. The default interface for hourly data retention period is 30 days.
Resolve this issue by setting the chart sample interval to Once a day, or by increasing the Interface Statistics hourly retention interval.
To change the chart settings
To change the retention settings:
Note: Changing the chart and retention settings result in a slightly larger database.