move runtime debug funcs in own package (#4494)

To make local debuging with `go run` easyer moved all files into a
dedicate package `runtime`.
This allows running prometheus just by using `go run main.go` instead of
passing mani files like `go run main.go limits_default.go ...`

Signed-off-by: Krasi Georgiev <kgeorgie@redhat.com>

cmd/prometheus/main.go

@@ -39,6 +39,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/model"
 	"github.com/prometheus/common/version"
+	prom_runtime "github.com/prometheus/prometheus/pkg/runtime"
 	"gopkg.in/alecthomas/kingpin.v2"
 	k8s_runtime "k8s.io/apimachinery/pkg/util/runtime"
 
@@ -229,9 +230,9 @@ func main() {
 
 	level.Info(logger).Log("msg", "Starting Prometheus", "version", version.Info())
 	level.Info(logger).Log("build_context", version.BuildContext())
-	level.Info(logger).Log("host_details", Uname())
-	level.Info(logger).Log("fd_limits", FdLimits())
-	level.Info(logger).Log("vm_limits", VmLimits())
+	level.Info(logger).Log("host_details", prom_runtime.Uname())
+	level.Info(logger).Log("fd_limits", prom_runtime.FdLimits())
+	level.Info(logger).Log("vm_limits", prom_runtime.VmLimits())
 
 	var (
 		localStorage  = &tsdb.ReadyStorage{}

pkg/runtime/limits_default.go

@@ -13,7 +13,7 @@
 
 // +build !windows
 
-package main
+package runtime
 
 import (
 	"fmt"

pkg/runtime/limits_windows.go

@@ -13,7 +13,7 @@
 
 // +build windows
 
-package main
+package runtime
 
 // FdLimits not supported on Windows
 func FdLimits() string {

pkg/runtime/uname_default.go

@@ -13,7 +13,7 @@
 
 // +build !linux
 
-package main
+package runtime
 
 import "runtime"
 

pkg/runtime/uname_linux.go

@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package main
+package runtime
 
 import (
 	"log"

pkg/runtime/uname_linux_int8.go

@@ -14,7 +14,7 @@
 // +build 386 amd64 arm64 mips64 mips64le mips mipsle
 // +build linux
 
-package main
+package runtime
 
 func charsToString(ca []int8) string {
 	s := make([]byte, 0, len(ca))

pkg/runtime/uname_linux_uint8.go

@@ -14,7 +14,7 @@
 // +build arm ppc64 ppc64le s390x
 // +build linux
 
-package main
+package runtime
 
 func charsToString(ca []uint8) string {
 	s := make([]byte, 0, len(ca))

pkg/runtime/vmlimits_default.go

@@ -14,7 +14,7 @@
 // +build !windows
 // +build !openbsd
 
-package main
+package runtime
 
 import (
 	"syscall"

pkg/runtime/vmlimits_openbsd.go

@@ -13,7 +13,7 @@
 
 // +build openbsd
 
-package main
+package runtime
 
 import (
 	"syscall"