I am using nomad and i want to configure the scaling policy inside my nomad file.

Right now i am using

check "allocations-counts" {
          source = "prometheus"
          query  = "nomad_client_allocations_running{node_class="myclass"}"

          strategy "threshold" {
            upper_bound = 3
            delta       = -1
          }
        }

After deploying this above config does not work and it says “

failed to query source: query returned 4 metric streams, only 1 is
expected
”
So actually in my prometheus if i run this query it gives me lots o results saying like

node_class=abcd count 5,
node_class=ebhg count 2,
node_class=kklj count 19,
node_class=erty count 7

Basically what i want to achieve is:

• If we haev any allocation with 2 (this is the excat number i want) like in above result qualifying is ebhg, then my auto scaling target for aws asg should reduce the ec2 (basically delta = -1)

Anyone suggest what config should i use?