How to download and setup collectd
Open terminal and run command
                                            git clone https://github.com/collectd/collectd.git
                                        
                                        git clone is used to create a copy or clone of collectd 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 collectd https://github.com/collectd/collectd/archive/master.zip
Or simply clone collectd with SSH
                                            [email protected]:collectd/collectd.git                                    
                                    If you have some problems with collectd
You may open issue on collectd support forum (system) here: https://github.com/collectd/collectd/issuesSimilar to collectd repositories
Here you may see collectd alternatives and analogs
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