confdroid_alloy/templates/config.alloy.erb

<% if @ay_manage_loki == true -%>

// Define file discovery for your logs
local.file_match "system_logs" {
  path_targets = [
<% @log_targets_array.each do |target| -%>
    {__path__ = "<%= target %>"},
<% end -%>
  ]
  sync_period = "5s"
}

// Scrape the logs from the matched files
loki.source.file "system_logs" {
  targets    = local.file_match.system_logs.targets
  forward_to = [loki.relabel.add_labels.receiver]
}

// Add hostname as a label explicitly
loki.process "add_hostname" {
  forward_to = [loki.relabel.add_labels.receiver]
  stage.static_labels {
    values = {
      hostname = env("HOSTNAME"),  // Pulls from $HOSTNAME, defaults to "unknown-host"
    }
  }
}

// Add hostname and job labels
loki.relabel "add_labels" {
  forward_to = [loki.write.loki.receiver]
  rule {
    source_labels = ["__host__"]  // Internal hostname from constants.hostname
    target_label  = "hostname"
  }
  rule {
    action       = "replace"
    target_label = "hostname"
    replacement  = "$HOSTNAME"
  }
  rule {
    action       = "replace"
    target_label = "job"
    replacement  = "syslogs"  // Or any name you prefer, e.g., "syslogs"
  }
}

loki.write "loki" {
  endpoint {
    url = "<%= @ay_loki_url %>"
    basic_auth {
      username = "<%= @ay_loki_username %>"
      password = "<%= @ay_loki_userpass %>"
    }
  }
}
<% end -%>
<% if @ay_manage_prom == true -%>
// Metrics collection
prometheus.exporter.unix "system_metrics" {
  include_exporter_metrics = true
  disable_collectors       = ["mdadm"]
}

prometheus.scrape "scrape_system" {
  targets    = prometheus.exporter.unix.system_metrics.targets
  forward_to = [prometheus.remote_write.prometheus.receiver]
  scrape_interval = "15s"
}

prometheus.remote_write "prometheus" {
  endpoint {
    url = "<%= @ay_prom_url %>"
    basic_auth {
      username = "<%= @ay_loki_username %>"
      password = "<%= @ay_loki_userpass %>"
    }
  }
}
<% end %>