Expand Time Range does not account for pagination

[chejimmy]

What happened:

When the request paginating, the last observation (last data point before the time range) is also returned. However, when time series panel renders, it creates an extra line across the panel.

Related code https://github.com/grafana/iot-sitewise-datasource/blob/main/pkg/server/last-observation.go#L54C27-L54C41

What you expected to happen:

No last observation added to paginating request.

How to reproduce it (as minimally and precisely as possible):

1. add a query with Expand Time Range support
2. add an asset + property
3. enable Expand Time Range
4. select time range greater than 6 hour or any other ways to make query to paginate
5. notice there's a line across the very first data point and the start of the second page of the data

Screenshots

See comment #315 (comment)

Anything else we need to know?:

Environment:

• Grafana version: 9.4 (or any)
• Plugin version: since "Expand Time Range" support
• OS Grafana is installed on: N/A
• User OS & Browser: MacOS 14.3 (23D56) / Google Chrome Version 125.0.6422.112
• Others:

[chejimmy]

Screen.Recording.2024-06-04.at.11.16.52.AM.mov

[idastambuk]

Hi @chejimmy thanks for reporting this! I've managed to reproduce it and will add it to our pipeline