Grafana is running this query against Prometheus server against the Prometheus 
endpoint to capture the “Job” values.
 
I have a “gpu-node” job and a “cpu-node” job configured in Prometheus.yml.

I don’t know why the following query (which Grafana is running) to pull both 
lists of nodes isn’t pulling all systems reporting in both “job”s unless I set 
change the date range to >24 hours.

For example:

This is <24hrs in the past from my current time
 
api/v1/series?match%5B%5D=node_uname_info&start=2020-06-26T5:23:00Z&end=2020-06-27T23:23:00Z
 – this will only return 1 “job” value (cpu-node) job.
 
This is >24 hours in the past. 
api/v1/series?match%5B%5D=node_uname_info&start=2020-06-25T5:23:00Z&end=2020-06-27T23:23Z
 – this will return all of the “job” values (both, cpu-node and gpu-node).
 
I have checked and validated that the systems reporting into gpu-node do have 
data within the last 5 min. Why isn’t the endpoint showing that there is data 
from these systems?
 
When/How does this endpoint get updated properly that it pulls _all_ “Job” 
values?

Any help would be appreciated.

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