sudo apt-get install sysstat

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   184  100   184    0     0    309      0 --:--:-- --:--:-- --:--:--   859
100 17616  100 17616    0     0  19108      0 --:--:-- --:--:-- --:--:-- 19108


Installing Datadog Agent 4.2.1


Creating Agent directory /root/.datadog-agent..... Done
Creating log file /root/.datadog-agent/ddagent-install.log.....Done
Setting up virtual environment.....Done
Setting up setuptools and pip.....Done
Installing tornado 2.4.1 using pip.....Done
Downloading the latest version of the Agent from github (~2.5 MB).....Done
Uncompressing the archive.....Done
Configuring datadog.conf file......Done
Setting up launching scripts.....Done
Setting up supervisor.....Done
Consolidating logging.....Done
Cleaning up the installation directory.....Done
Starting the Agent.....Done

    Your Agent has started up for the first time. We're currently verifying
    that data is being submitted. You should see your Agent show up in Datadog
    shortly at:

        https://app.datadoghq.com/infrastructure

Waiting for metrics.................................

    Success! Your Agent is functioning properly, and will continue to run
    in the foreground. To stop it, simply press CTRL-C. To start it back
    up again in the foreground, run:

    cd /root/.datadog-agent
    sh bin/agent

$ sudo su
# cd /root/.datadog-agent/bin
# ./agent info

Traceback (most recent call last):
  File "agent/ddagent.py", line 32, in <module>
    import tornado.httpserver
ImportError: No module named tornado.httpserver

# pip install tornado