add throughput/latency estimators to admin servers

[PratikDeoghare]

This adds pprof style handlers to the proxy-{server,agent} but for estimating throughput/latency.

This lets us avoid complicated setup required when using existing command line tools like qperf/iperf.

Run proxy-server and proxy-agent with profiling enabled.

$ ./bin/proxy-server --server-port=0 --uds-name=/tmp/uds-proxy --cluster-ca-cert=certs/agent/issued/ca.crt --cluster-cert=certs/agent/issued/proxy-frontend.crt --cluster-key=certs/agent/private/proxy-frontend.key --proxy-strategies=default --server-count=1 -v=100 \
--admin-port=9999 --enable-profiling=true 

$ ./bin/proxy-agent --ca-cert=certs/agent/issued/ca.crt --agent-cert=certs/agent/issued/proxy-agent.crt --agent-key=certs/agent/private/proxy-agent.key --admin-server-port=9094 --health-server-port=9095 --agent-identifiers=ipv4=127.0.0.2 -v=100 \
 --admin-server-port=8888 --enable-profiling=true

This will trigger benchmarking server.

curl http://localhost:8888/benchmate/throughput --data '
{
    "msgSize": 128000,
    "numMsg": 10000,
    "network": "tcp",
    "addr": ":13501",
    "timeout": 120000
}'

This will trigger benchmarking client.

curl -s http://localhost:9999/benchmate/throughput --data '
{
    "msgSize": 128000,
    "numMsg": 10000,
    "network": "tcp",
    "addr": ":13501",
    "timeout": 120000,
    "client": true
}' | jq . 

You get output like this at the client.

{
  "msgSize": 128000,
  "numMsg": 10000,
  "elapsed": 405804038,
  "avgThroughput": 3154.2317969738883
}

For details read benchmate docs.

[k8s-ci-robot]

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[PratikDeoghare]

why no protoc there? :thinking: /retest

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/remove-lifecycle stale

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@PratikDeoghare: PR needs rebase.

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/close

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@k8s-triage-robot: Closed this PR.

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