Network graph toggle "only errors"

[kirillyu]

We deployed coroot to services where there are hundreds of replicas. And also in clusters where there are hundreds of services. Current filtering involves drilling down to the level of the final service. But we were faced with the fact that on all graphs and maps inside coroot, it is impossible to filter only erroneous requests and TCP connections. Inside the huge number of green lines, it is impossible to see the red one. I think it would be cool to have a toggle - "only errors"