How to download and setup dd-agent
Open terminal and run command
                                            git clone https://github.com/DataDog/dd-agent.git
                                        
                                        git clone is used to create a copy or clone of dd-agent repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with dd-agent https://github.com/DataDog/dd-agent/archive/master.zip
Or simply clone dd-agent with SSH
                                            [email protected]:DataDog/dd-agent.git                                    
                                    If you have some problems with dd-agent
You may open issue on dd-agent support forum (system) here: https://github.com/DataDog/dd-agent/issuesSimilar to dd-agent repositories
Here you may see dd-agent alternatives and analogs
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