colmena initial implementation for sandbox and monitor

machines/monitor/loki.nix

@@ -0,0 +1,37 @@
+{
+  networking.firewall.allowedTCPPorts = [ 3100 ];
+
+  services.loki = {
+    enable = true;
+    configuration = {
+      server.http_listen_port = 3100;
+      auth_enabled = false;
+      analytics.reporting_enabled = false;
+
+      common = {
+        ring = {
+          instance_addr = "127.0.0.1";
+          kvstore.store = "inmemory";
+        };
+        replication_factor = 1;
+        path_prefix = "/tmp/loki";
+      };
+
+      schema_config = {
+        configs = [
+          {
+            from = "2020-05-15";
+            store = "tsdb";
+            object_store = "filesystem";
+            schema = "v13";
+            index = {
+              prefix = "index_";
+              period = "24h";
+            };
+          }
+        ];
+      };
+      storage_config.filesystem.directory = "/var/lib/loki/chunk";
+    };
+  };
+}