I don't understand loop

[mr1jingles]

Hello, I need help understanding this code:

body common control
{
    inputs => { "$(sys.libdir)/stdlib.cf" };
}

bundle agent main
{
    vars:
        "sysctl_file"       data => '{ sysctl: "/etc/sysctl.conf" }';
        "sysctl_params"   data => '{
            "sysctl": {
                "net.ipv4.tcp_syncookies": "1",
                "net.ipv4.conf.all.accept_source_route": "0",
                "net.ipv4.conf.all.accept_redirects": "0",
                "net.ipv4.conf.all.rp_filter": "1",
                "net.ipv4.conf.all.log_martians": "1"
            }
        }'; 
        "keys"  slist => getindices("sysctl_params[sysctl]");

    reports:
        "Show sysctl parameters: $(sysctl_params[sysctl][$(keys)])";
}

I see only 2 values:

R: Show sysctl parameters: 1
R: Show sysctl parameters: 0

Why only 2 values?

And if I write this way:

body common control
{
    inputs => { "$(sys.libdir)/stdlib.cf" };
}

bundle agent main
{
    vars:
        "sysctl_file"       data => '{ sysctl: "/etc/sysctl.conf" }';
        "sysctl_params"   data => '{
            "sysctl": {
                "net.ipv4.tcp_syncookies": "1",
                "net.ipv4.conf.all.accept_source_route": "0",
                "net.ipv4.conf.all.accept_redirects": "0",
                "net.ipv4.conf.all.rp_filter": "1",
                "net.ipv4.conf.all.log_martians": "1"
            }
        }'; 
        "keys"  slist => getindices("sysctl_params[sysctl]");

    reports:
        "Show sysctl $(keys) parameters: $(sysctl_params[sysctl][$(keys)])";
}

I receive all the values:

R: Show sysctl net.ipv4.tcp_syncookies parameters: 1
R: Show sysctl net.ipv4.conf.all.accept_source_route parameters: 0
R: Show sysctl net.ipv4.conf.all.accept_redirects parameters: 0
R: Show sysctl net.ipv4.conf.all.rp_filter parameters: 1
R: Show sysctl net.ipv4.conf.all.log_martians parameters: 1

Why does it work this way? Thanks

[amousset]

Why only 2 values?

Because a report acts like another promise type, which means if it is considered as already correct it will be skipped in next identical iterations. In the case of a report, it means if a particular string has already been printed, it will not be printed again, hence only two lines.

When adding the name of the parameter, all lines are unique, making all reports unique (and printed).

[mr1jingles]

Thank you!