Non-Aggregated Data has constant value and cut-off/time-shifting while Aggregated data is being shown correctly

[thurban]

Describe the bug
The data from the rrd file seems to be inconsistent. The LAST non-aggregated data is showing constant values for some date ranges. The aggregated data (i.e. using a broader time range to force using it for the graphs) shows correctly aggregated data.

The issue with the LAST/non-aggregated data seems to shift (compare "after" with "earlier" rrd/xml) like it is a misconfiguration of the rrd file limiting the data.

The data comes from Cacti, normal switch interface data. It may be a corrupt rrdfile or a sudden change. Unable to identify any mis-configuration though.

To Reproduce
See attached images, rrd files, XML exports and graphs showing the issue

Expected behavior
LAST should be aggregated correctly.

Screenshots
[
17078_after_rrd.zip
17078_after_xml.zip
17078_earlier_rrd.zip
17078_earlier_xml.zip

RRD_Commands_Used.txt


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Desktop (please complete the following information):

• Linux / 64 bit
• RRDtool 1.7.0 Copyright by Tobias Oetiker [email protected] Compiled Jun 11 2021 00:16:12

Additional context
The issue did go away after some time.