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I'm trying to implement my own metrics endpoint to show a time-series of values.  I've successfully created my own prometheus format exporter, and signoz is configured to pull that data in.

When I omit the timestamps from the prometheus format (so it looks like this:
```name {} 3.0```
then I get a horizontal line, so no time-series, just one value only.

Then I put the timestamps in, like this:
```name {} 3.0 1663923600```
for example, then it successfully imports but when I try and create the dashboard it says "no data available"

There is a metric I can view called "system_cpu_load_average_15m" which shows a graph time-series the way I want to, but I can't find the raw prometheus endpoint to see how that data is being formatted for export

I've exposed port 8888 on the internal metrics server, but there are no metrics with that name being exposed so I'm unable to view the raw prometheus data format for that metric