Add coral pci dual tpu temperature metrics to netdata

apex.chart.sh

# Put me at /usr/libexec/netdata/charts.d/apex.chart.sh 
# shellcheck shell=bash
# no need for shebang - this file is a plugin

# Initialization function
# Used to check if the required commands are available
apex_check() {
    require_cmd cat || return 1
    return 0
}

# Create the charts
apex_create() {
    cat <<EOF
CHART apex.temp '' "Apex Temperature" "Celsius" "apex" "apex.temp" line $((apex_update_every)) $((apex_update_every / 2))
DIMENSION apex_0 'apex_0' absolute 1 1000
DIMENSION apex_1 'apex_1' absolute 1 1000
EOF
    return 0
}

# Data collection function
apex_update() {
    local microseconds="$1"
    local apex_0=$(cat /sys/class/apex/apex_0/temp)
    local apex_1=$(cat /sys/class/apex/apex_1/temp)

    cat <<EOF
BEGIN apex.temp $microseconds
SET apex_0 = $apex_0
SET apex_1 = $apex_1
END
EOF
    return 0
}

# The frequency to collect data
apex_update_every=5

# The order of execution
apex_check
apex_create
apex_update "$@"