[DEVOPS-1013] bump nixpkgs and add enablePhaseMetrics=true

Author: disassembler

default.nix

@@ -19,6 +19,7 @@ in
 , enableProfiling ? false
 , enableDebugging ? false
 , enableBenchmarks ? true
+, enablePhaseMetrics ? true
 , allowCustomConfig ? true
 , useStackBinaries ? false
 }:
@@ -116,13 +117,20 @@ let
     });
   };
 
+  metricOverlay = self: super: {
+    mkDerivation = args: super.mkDerivation (args // {
+      enablePhaseMetrics = true;
+    });
+  };
+
   cardanoPkgsBase = ((import ./pkgs { inherit pkgs; }).override {
     ghc = overrideDerivation pkgs.haskell.compiler.ghc822 (drv: {
       patches = drv.patches ++ [ ./ghc-8.0.2-darwin-rec-link.patch ];
     });
   });
 
   activeOverlays = [ requiredOverlay ]
+      ++ optional enablePhaseMetrics metricOverlay
       ++ optional enableBenchmarks benchmarkOverlay
       ++ optional enableDebugging debugOverlay
       ++ optional forceDontCheck dontCheckOverlay;

nixpkgs-src.json

@@ -1,5 +1,5 @@
 {
-    "rev":            "118431d4d68c68a6605932d94aae0a75a8309d95",
-    "sha256":         "0w2a1ll8c5bysjqbm1ljzcgrmf0gkwm1c97xpfsb8k3ns56x4h52",
-    "sha256unpacked": "146z9syzfiq1phq3gs2kacq2zcvyzbpzxy52vhjgxhm1ygy449lm"
+    "rev":            "4250ed05520fe19bb3a176f313a06a48e03fbe0e",
+    "sha256":         "139hv9scw2hrdrrkmq0msnsvg8q4mg5d3m8inf8kq3m76pbp1h77",
+    "sha256unpacked": "1bihcn6mmhr7g2pyms8iircwfg53prx7jphnwdw3ifwk4q5fjxnq"
 }