Replace telegraf with node exporter

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/configs/system/sshd/default.nix

@@ -1,13 +1,5 @@
 { ... }:
 {
-  nixpkgs.overlays = [
-    (final: prev: {
-      fail2ban = prev.fail2ban.overrideAttrs (oldAttrs: {
-        patches = oldAttrs.patches or [ ] ++ [ ./remove-umask.patch ];
-      });
-    })
-  ];
-
   environment = {
     enableAllTerminfo = true;
     persistence."/persist/state"."/var/lib/fail2ban" = { };
@@ -32,12 +24,4 @@
       };
     };
   };
-
-  systemd.services.fail2ban.serviceConfig = {
-    User = "root";
-    Group = "fail2ban";
-    UMask = "0117";
-  };
-
-  users.groups.fail2ban = { };
 }

hosts/common/configs/system/sshd/remove-umask.patch

@@ -1,15 +0,0 @@
-diff --git a/fail2ban/server/server.py b/fail2ban/server/server.py
-index e438c4ca..aeee4075 100644
---- a/fail2ban/server/server.py
-+++ b/fail2ban/server/server.py
-@@ -108,9 +108,7 @@ class Server:
- 		signal.signal(s, new)
- 
- 	def start(self, sock, pidfile, force=False, observer=True, conf={}):
--		# First set the mask to only allow access to owner
--		os.umask(0o077)
--		# Second daemonize before logging etc, because it will close all handles:
-+		# Daemonize before logging etc, because it will close all handles:
- 		if self.__daemon: # pragma: no cover
- 			logSys.info("Starting in daemon mode")
- 			ret = self.__createDaemon()