falkenstein: remove postfix exporter

overlays/default.nix

@@ -112,16 +112,4 @@ in
       pythonPath = python.pkgs.makePythonPath propagatedBuildInputs;
     };
   });
-  # (hopefully) fix systemd journal reading
-  prometheus-postfix-exporter = prev.prometheus-postfix-exporter.overrideAttrs (_old: {
-    patches = [
-      ./prometheus-postfix-exporter/0001-cleanup-also-catch-milter-reject.patch
-    ];
-    src = fetchFromGitHub {
-      owner = "adangel";
-      repo = "postfix_exporter";
-      rev = "414ac12ee63415eede46cb3084d755a6da6fba23";
-      hash = "sha256-m1kVaO3N7XC1vtnxXX9kMiEFPmZuoopRUYgA7gQzP8w=";
-    };
-  });
 }

overlays/prometheus-postfix-exporter/0001-cleanup-also-catch-milter-reject.patch

@@ -1,25 +0,0 @@
-From f4c5dd5628c873981b2d6d6b8f3bbf036b9fd724 Mon Sep 17 00:00:00 2001
-From: Rouven Seifert <rouven.seifert@ifsr.de>
-Date: Thu, 2 May 2024 11:20:27 +0200
-Subject: [PATCH] cleanup: also catch milter-reject
-
----
- postfix_exporter.go | 2 ++
- 1 file changed, 2 insertions(+)
-
-diff --git a/postfix_exporter.go b/postfix_exporter.go
-index f20d99c..676d767 100644
---- a/postfix_exporter.go
-+++ b/postfix_exporter.go
-@@ -335,6 +335,8 @@ func (e *PostfixExporter) CollectFromLogLine(line string) {
- 				e.cleanupProcesses.Inc()
- 			} else if strings.Contains(remainder, ": reject: ") {
- 				e.cleanupRejects.Inc()
-+			} else if strings.Contains(remainder, ": milter-reject: ") {
-+				e.cleanupRejects.Inc()
- 			} else {
- 				e.addToUnsupportedLine(line, subprocess, level)
- 			}
--- 
-2.44.0
-