No data showing
Quick check
- Is data flowing? Check the connection status + the Live Stream panel.
- Is the surface wired to the right connection?
- Is the time window right? Widen it.
Step by step
1. Connection status
| Indicator | Meaning | Do |
|---|---|---|
| Green | data flowing | connection is fine |
| Yellow | warning | check configuration |
| Red | no data | confirm the source is sending |
| Gray | unknown | refresh or reconfigure |
Confirm the source (live device, API Source, database) is running and its credentials are valid. From
an AI, watch with tail_telemetry.
2. Surface wiring - open the surface and confirm it's fed by the connection that's receiving data (a common cause is wiring to the wrong connection, or none).
3. Time window
// instead of the last hour:
| where Timestamp > ago(1h)
// try the last day:
| where Timestamp > ago(24h)
If the data arrived before your window, it won't appear. Start wide, then narrow.
4. Test with the simulator - wire a simulator to the surface. If simulator data appears, the issue is the external source; if not, check the surface configuration.
Common causes
| Cause | Looks like | Fix |
|---|---|---|
| source not sending | connection shows no data | check the external source |
| wrong connection | other data appears | rewire to the right connection |
| time window | runs but empty | widen the range |
| field mismatch | some fields empty | check field names |
| permissions | access denied | check team access |
Still nothing? Build a test surface with a simulator and compare. Or see Query returns empty.