Ceph

The "MDS performance counters" graph (in File Systems -> <fs name> > Details) occasionally draws the fill above the line graph (not between y axis zero and current value, but above the current value) and the latest data point on x axis jumps backwards in time.

Attached is a series of 3 screenshots in chronological order from oldest on top to latest at the bottom.

• Screenshot 1: shows the error where the fill is above the line and not below it (towards y axis zero). It also shows the latest value on x axis jumping backwards in time.
• Screenshot 2: same error but later point in time.
• Screenshot 3: without any changes to configuration, later the chart started drawing correctly.