gVisor metrics: Move the metric server to its own package.

PiperOrigin-RevId: 533254583

runsc/cmd/BUILD

@@ -53,7 +53,6 @@ go_library(
     visibility = ["//runsc:__subpackages__"],
     deps = [
         "//pkg/abi/linux",
-        "//pkg/atomicbitops",
         "//pkg/cleanup",
         "//pkg/coretag",
         "//pkg/coverage",
@@ -66,10 +65,8 @@ go_library(
         "//pkg/sentry/kernel",
         "//pkg/sentry/kernel/auth",
         "//pkg/sentry/platform",
-        "//pkg/state",
         "//pkg/state/pretty",
         "//pkg/state/statefile",
-        "//pkg/sync",
         "//pkg/unet",
         "//pkg/urpc",
         "//runsc/boot",
@@ -80,9 +77,9 @@ go_library(
         "//runsc/flag",
         "//runsc/fsgofer",
         "//runsc/fsgofer/filter",
+        "//runsc/metricserver",
         "//runsc/mitigate",
         "//runsc/profile",
-        "//runsc/sandbox",
         "//runsc/specutils",
         "@com_github_google_subcommands//:go_default_library",
         "@com_github_opencontainers_runtime_spec//specs-go:go_default_library",

runsc/cmd/metric_export.go

@@ -26,6 +26,7 @@ import (
 	"gvisor.dev/gvisor/runsc/config"
 	"gvisor.dev/gvisor/runsc/container"
 	"gvisor.dev/gvisor/runsc/flag"
+	"gvisor.dev/gvisor/runsc/metricserver"
 )
 
 // MetricExport implements subcommands.Command for the "metric-export" command.
@@ -71,7 +72,7 @@ func (m *MetricExport) Execute(ctx context.Context, f *flag.FlagSet, args ...any
 		util.Fatalf("loading container: %v", err)
 	}
 
-	prometheusLabels, err := sandboxPrometheusLabels(cont)
+	prometheusLabels, err := metricserver.SandboxPrometheusLabels(cont)
 	if err != nil {
 		util.Fatalf("Cannot compute Prometheus labels of sandbox: %v", err)
 	}

runsc/metricserver/BUILD

@@ -0,0 +1,26 @@
+load("//tools:defs.bzl", "go_library")
+
+package(
+    default_applicable_licenses = ["//:license"],
+    licenses = ["notice"],
+)
+
+go_library(
+    name = "metricserver",
+    srcs = [
+        "metricserver.go",
+    ],
+    visibility = ["//runsc:__subpackages__"],
+    deps = [
+        "//pkg/abi/linux",
+        "//pkg/atomicbitops",
+        "//pkg/log",
+        "//pkg/prometheus",
+        "//pkg/sentry/control",
+        "//pkg/state",
+        "//pkg/sync",
+        "//runsc/config",
+        "//runsc/container",
+        "//runsc/sandbox",
+    ],
+)