Rudder

So, after investigation, for a given node, when there is a missing, it's because getExecutionReports doesn't return any reports.
It looks for reports AgentRunId(NodeId(a8f00955-7a4c-4e1e-8578-f4ef7909fcc0),2021-08-03T11:13:45.000+02:00)
But there is no run in ruddersysevents with an executiontimestamp of 11:13:45.000+02:00 for this node

 8940 | 2021-08-03 11:13:46+02 | a8f00955-7a4c-4e1e-8578-f4ef7909fcc0 | inventory-all                        | inventory-all                        |      0 | inventory               | None                     | 20
21-08-03 11:13:46+02 | result_success  | Inventory | Next inventory scheduled between 00:00 and 06:00

 8928 | 2021-08-03 11:13:46+02 | a8f00955-7a4c-4e1e-8578-f4ef7909fcc0 | run                                  | rudder                               |      0 | start                   | 20210802-174301-fafcc7a4 | 20
21-08-03 11:13:46+02 | control         | Common    | Start execution

Yet, in reportsexecution, there is this timestamp, which causes the error

 a8f00955-7a4c-4e1e-8578-f4ef7909fcc0 | 2021-08-03 11:13:45+02 | 20210802-174301-fafcc7a4 |        8928 | 2021-08-03 09:13:48.422369 | 2021-08-03 11:13:52.208357

other node don't have this value either

The inserted timestamp was the timestamp of the agent start (i.e. rudder agent run command) and not the timestamp of the first report, which is what the webapp expects.