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"