prometheus: remove prometheus_1, rename prometheus_2

As prometheus is no longer developed, nixpkgs now only includes
prometheus 2. Having only one version of prometheus, there is no need
for having the version in the attribute name.

pkgs/servers/monitoring/prometheus/default.nix

@@ -1,54 +1,46 @@
-{ stdenv, go, buildGoPackage, fetchFromGitHub }:
+{ lib, go, buildGoPackage, fetchFromGitHub }:
 
 let
   goPackagePath = "github.com/prometheus/prometheus";
-in rec {
-  buildPrometheus = { version, sha256, doCheck ? true, ... }@attrs:
-    let attrs' = builtins.removeAttrs attrs ["version" "sha256"]; in
-      buildGoPackage ({
-        name = "prometheus-${version}";
+in
+buildGoPackage rec {
+  pname = "prometheus";
+  version = "2.12.0";
 
-        inherit goPackagePath;
+  inherit goPackagePath;
 
-        src = fetchFromGitHub {
-          rev = "v${version}";
-          owner = "prometheus";
-          repo = "prometheus";
-          inherit sha256;
-        };
-
-        buildFlagsArray = let t = "${goPackagePath}/vendor/github.com/prometheus/common/version"; in ''
-          -ldflags=
-             -X ${t}.Version=${version}
-             -X ${t}.Revision=unknown
-             -X ${t}.Branch=unknown
-             -X ${t}.BuildUser=nix@nixpkgs
-             -X ${t}.BuildDate=unknown
-             -X ${t}.GoVersion=${stdenv.lib.getVersion go}
-        '';
-
-        preInstall = ''
-          mkdir -p "$bin/share/doc/prometheus" "$bin/etc/prometheus"
-          cp -a $src/documentation/* $bin/share/doc/prometheus
-          cp -a $src/console_libraries $src/consoles $bin/etc/prometheus
-        '';
-
-        meta = with stdenv.lib; {
-          description = "Service monitoring system and time series database";
-          homepage = https://prometheus.io;
-          license = licenses.asl20;
-          maintainers = with maintainers; [ benley fpletz globin ];
-          platforms = platforms.unix;
-        };
-    } // attrs');
-
-  prometheus_1 = buildPrometheus {
-    version = "1.8.2";
-    sha256 = "088flpg3qgnj9afl9vbaa19v2s1d21yxy38nrlv5m7cxwy2pi5pv";
-  };
-
-  prometheus_2 = buildPrometheus {
-    version = "2.12.0";
+  src = fetchFromGitHub {
+    rev = "v${version}";
+    owner = "prometheus";
+    repo = "prometheus";
     sha256 = "1ci9dc512c1hry1b8jqif0mrnks6w3yagwm3jf69ihcwilr2n7vs";
   };
+
+  buildFlagsArray = let
+    t = "${goPackagePath}/vendor/github.com/prometheus/common/version";
+  in ''
+    -ldflags=
+       -X ${t}.Version=${version}
+       -X ${t}.Revision=unknown
+       -X ${t}.Branch=unknown
+       -X ${t}.BuildUser=nix@nixpkgs
+       -X ${t}.BuildDate=unknown
+       -X ${t}.GoVersion=${lib.getVersion go}
+  '';
+
+  preInstall = ''
+    mkdir -p "$bin/share/doc/prometheus" "$bin/etc/prometheus"
+    cp -a $src/documentation/* $bin/share/doc/prometheus
+    cp -a $src/console_libraries $src/consoles $bin/etc/prometheus
+  '';
+
+  doCheck = true;
+
+  meta = with lib; {
+    description = "Service monitoring system and time series database";
+    homepage = "https://prometheus.io";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ benley fpletz globin willibutz ];
+    platforms = platforms.unix;
+  };
 }

pkgs/top-level/all-packages.nix

@@ -15014,13 +15014,8 @@ in
 
   postgresql_jdbc = callPackage ../development/java-modules/postgresql_jdbc { };
 
-  inherit (callPackage ../servers/monitoring/prometheus { }) prometheus_1;
-
-  inherit (callPackage ../servers/monitoring/prometheus { })
-    prometheus_2;
-
   prom2json = callPackage ../servers/monitoring/prometheus/prom2json.nix { };
-  prometheus = prometheus_1;
+  prometheus = callPackage ../servers/monitoring/prometheus { };
   prometheus-alertmanager = callPackage ../servers/monitoring/prometheus/alertmanager.nix { };
   prometheus-aws-s3-exporter = callPackage ../servers/monitoring/prometheus/aws-s3-exporter.nix { };
   prometheus-bind-exporter = callPackage ../servers/monitoring/prometheus/bind-exporter.nix { };