What i found out so far. The data is available but the behaviour of the Graph-Setup changed somehow (so far this was still a miracle for me).
When i just setup the graph and he chooses the fixed intervall number (which is default) - in this picture 900 - the data is missing
The hole data viewer is not realy working properly as the behaviour of this page is more miracle as understandable.
When i save the intervall 100 stepping out and in again then the data is vanished again.
not very amusing this tool
I am lost to fix this bug - for me this is a bug is i define a graph and its gone after reload and after selecting the changes
And when i save the changes to the graph they are lost and only after repeating several times they are taken.
For me this Graphs are the most annoying part of this great solution and full of bugs. Its cumbersome to edit and update this graphs and sometime only making them new helps.
Update doesnt work at all. so after 1h of retrying and saving several times the graphs now show all the date again. lets see how long
For the first issue, try enabling averaging for each feed in the options box below the graph. It looks like the data coming in is not particular regular but there may be more data present than you’re seeing. If you enable averaging it may show up.