function getContent(heartbeatJSON) {
    return [
        "**Message**: " + heartbeatJSON["msg"],
        "**Ping**: " + (heartbeatJSON["ping"] == null ? "N/A" : heartbeatJSON["ping"] + " ms"),
        `**Time (${heartbeatJSON["timezone"]})**: ${heartbeatJSON["localDateTime"]}`
    ].join("\n");
}
Get content
@param {?object} heartbeatJSON Heartbeat details (For Up/Down only)
@returns {string} Return Successful Message