Generate and send StatsD test metrics

send-statsd-test-metrics.sh

#!/bin/bash

DEFAULT='\033[0m'
HI_CYAN='\033[0;96m'
HI_WHITE='\033[0;93m'

STATSD_HOST=127.0.0.1
STATSD_PORT=8125

api_names=(orders invoice user)
max_index=$((${#api_names[@]} - 1))
num_metrics_per_second=4 # per second
requests_count=0

# send StatsD metrics over UDP localhost port 8125
while true;
    do
        # get a random api name and milliseconds between 50-150
        rand_index=$(shuf -i 0-$max_index -n 1)
        rand_ms=$(shuf -i 50-150 -n 1)
        rand_api_name=${api_names[$rand_index]}

        # build metric - format: test_api_call.[api_name].timer.[api_endpoint]
        metric="test_api_call.$rand_api_name-api.timer./v1/$rand_api_name:$rand_ms|ms"

        # send metric
        echo $metric | nc -w 0 -u $STATSD_HOST $STATSD_PORT

        # view generated metric
        printf "${HI_WHITE}echo ${HI_CYAN}$metric${DEFAULT} - ${rand_ms}ms\n"

        # control how many metric lines are emitted per second
        requests_count=$(($requests_count+1))
        if [ $requests_count == $num_metrics_per_second ]; then
            echo "sent $num_metrics_per_second metrics - $(date +'%T')"
            requests_count=0
            sleep 1
        fi

done

statsd-test-metrics-output.png