Should chart lines connect up when collectors disconnected?

[markallisongit]

If for some reason the performance monitor is offline or not collecting metrics from the targets, then should the graph lines connect? Personal feeling is they should not, and there should simply be a gap similar to how Red-Gate Monitor does this. If the lines connect, one could mistakenly infer that those are real data values rather than a gap in the data.

For example, in my screenshot, between the two red lines, my performance monitor was offline; however, the metric graph has a continuous line, and I think that's misleading.

[erikdarlingdata]

You are right, and I checked before answering rather than going by feel: there is no gap handling anywhere in the chart stack today. Every series connects consecutive points unconditionally, so an offline window renders exactly as your screenshot shows - a line claiming data that was never collected.

That is misleading and it will change. Tracked as #1944: lines will break when the gap between points exceeds a threshold derived from that series' own collection cadence, so normal jitter does not shatter the line but a real outage shows as a real gap. Deriving from the cadence matters because collectors here run at very different frequencies, from one minute to daily, and a single fixed threshold would either shatter slow series or paper over fast ones.

Thanks for the report and the screenshot - the comparison made the case in one image.