We just fixed a problem on our live systems which was preventing chart annotations working for some customers. Our latest update addresses this problem, but perhaps this is a good time to remind people about how to use the feature.

On charts where it makes sense to show "target" lines, setting the target group controls which target line is shown. For example if the target group is "CQC", the target lines are as shown below:

In this case set to CQC "good" is the selected target, and the line is shown as below.