Add histogram metrics of the requested resources

[ronensc]

Issue link

What changes have been made

This PR adds custom histogram metrics of a of the requested resources (CPU, Memory and GPU) by the AppWrappers.

Verification steps

Like in #651 and #675, I checked that the metrics are available in the codeflare-operator operator by running it:

# in codeflare-operator root
go mod edit -replace github.com/project-codeflare/multi-cluster-app-dispatcher=../multi-cluster-app-dispatcher
make build
NAMESPACE=default go run ./main.go -kubeconfig <path-to-kubeconfig>

and in a new shell:

curl localhost:8080/metrics | grep mcad_requested

# HELP mcad_requested_cpu Histogram of requested CPU (in millicores)
# TYPE mcad_requested_cpu histogram
mcad_requested_cpu_bucket{le="100"} 0
mcad_requested_cpu_bucket{le="200"} 0
mcad_requested_cpu_bucket{le="500"} 0
mcad_requested_cpu_bucket{le="1000"} 0
mcad_requested_cpu_bucket{le="2000"} 0
mcad_requested_cpu_bucket{le="5000"} 0
mcad_requested_cpu_bucket{le="10000"} 0
mcad_requested_cpu_bucket{le="+Inf"} 0
mcad_requested_cpu_sum 0
mcad_requested_cpu_count 0
# HELP mcad_requested_gpu Histogram of requested GPU
# TYPE mcad_requested_gpu histogram
mcad_requested_gpu_bucket{le="1"} 0
mcad_requested_gpu_bucket{le="2"} 0
mcad_requested_gpu_bucket{le="4"} 0
mcad_requested_gpu_bucket{le="8"} 0
mcad_requested_gpu_bucket{le="16"} 0
mcad_requested_gpu_bucket{le="32"} 0
mcad_requested_gpu_bucket{le="64"} 0
mcad_requested_gpu_bucket{le="128"} 0
mcad_requested_gpu_bucket{le="256"} 0
mcad_requested_gpu_bucket{le="512"} 0
mcad_requested_gpu_bucket{le="+Inf"} 0
mcad_requested_gpu_sum 0
mcad_requested_gpu_count 0
# HELP mcad_requested_memory_bytes Histogram of requested memory
# TYPE mcad_requested_memory_bytes histogram
mcad_requested_memory_bytes_bucket{le="1.34217728e+08"} 0
mcad_requested_memory_bytes_bucket{le="2.68435456e+08"} 0
mcad_requested_memory_bytes_bucket{le="5.36870912e+08"} 0
mcad_requested_memory_bytes_bucket{le="1.073741824e+09"} 0
mcad_requested_memory_bytes_bucket{le="2.147483648e+09"} 0
mcad_requested_memory_bytes_bucket{le="4.294967296e+09"} 0
mcad_requested_memory_bytes_bucket{le="8.589934592e+09"} 0
mcad_requested_memory_bytes_bucket{le="1.7179869184e+10"} 0
mcad_requested_memory_bytes_bucket{le="3.4359738368e+10"} 0
mcad_requested_memory_bytes_bucket{le="6.8719476736e+10"} 0
mcad_requested_memory_bytes_bucket{le="+Inf"} 0
mcad_requested_memory_bytes_sum 0
mcad_requested_memory_bytes_count 0

Checks

• I've made sure the tests are passing.
• Testing Strategy
  • Unit tests
  • Manual tests
  • Testing is not required for this change

[openshift-ci]

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