k 5: add kapacitor

we add this here until 17.03 is released

krebs/5pkgs/kapacitor/default.nix

@@ -0,0 +1,23 @@
+{ stdenv, lib, fetchFromGitHub, buildGoPackage }:
+
+buildGoPackage rec {
+  name = "kapacitor-${version}";
+  version = "1.0.0";
+
+  goPackagePath = "github.com/influxdata/kapacitor";
+
+  src = fetchFromGitHub {
+    owner = "influxdata";
+    repo = "kapacitor";
+    rev = "v${version}";
+    sha256 = "14l9bhj6qdif79s4dyqqbnjgj3m4iarvw0ckld1wdhpdgvl8w9qh";
+  };
+
+  meta = with lib; {
+    description = "Open source framework for processing, monitoring, and alerting on time series data";
+    license = licenses.mit;
+    homepage = https://influxdata.com/time-series-platform/kapacitor/;
+    maintainers = with maintainers; [offline];
+    platforms = with platforms; linux;
+  };
+}