This lab has been modernised but not yet verified end to end. Tell us if something breaks.

Prometheus

Lab Solution

Range queries need to include start, end and step parameters in the URL query string.

This example will work, but won't return any data - because you won't have any metrics stored for these dates:

curl 'localhost:9090/api/v1/query_range?query=fulfilment_in_flight_total&start=2021-07-11T00:01:30Z&end=2021-07-11T01:00Z&step=15s'

You'll see:

{"status":"success","data":{"resultType":"matrix","result":[]}}

You can use an RFC 3339 date or a Unix timestamp as the start and end values.

In PowerShell you can store the current date and one hour ago in variables like this:

$now=Get-Date
$end=(Get-Date -Date $now -UFormat %s)
$start=(Get-Date -Date $now.AddHours(-1) -UFormat %s)

OR in Linux/macOS:

now=$(date)
end=$(date -d $now +%s)
start="$(date -d "$now - 1 hours" +%s)"

Then query the API using the variables in the URL - this works for PowerShell and Bash:

curl "localhost:9090/api/v1/query_range?query=fulfilment_in_flight_total&start=$start&end=$end&step=30s"