resctrl-mon: add NRI plugin for per-pod resctrl monitoring groups

Makefile

@@ -83,7 +83,8 @@ PLUGINS ?= \
 	nri-memory-policy \
 	nri-memory-qos \
 	nri-memtierd \
-        nri-sgx-epc
+        nri-sgx-epc \
+	nri-resctrl-mon
 
 BINARIES ?= \
 	config-manager \

cmd/plugins/resctrl-mon/Dockerfile

@@ -0,0 +1,40 @@
+ARG GO_VERSION=1.26
+
+FROM golang:${GO_VERSION}-bookworm AS builder
+
+ARG IMAGE_VERSION
+ARG BUILD_VERSION
+ARG BUILD_BUILDID
+ARG DEBUG=0
+ARG NORACE=0
+ARG SKIP_LICENSES=0
+
+WORKDIR /go/builder
+
+# Fetch go dependencies in a separate layer for caching
+COPY go.mod go.sum .
+COPY pkg/topology/ pkg/topology/
+RUN --mount=type=cache,target=/go/pkg/mod/ go mod download
+
+# Build nri-resctrl-mon
+COPY . .
+
+RUN --mount=type=cache,target=/go/pkg/mod/ \
+    --mount=type=cache,target="/root/.cache/go-build" \
+    make IMAGE_VERSION=${IMAGE_VERSION} \
+         BUILD_VERSION=${BUILD_VERSION} \
+         BUILD_BUILDID=${BUILD_BUILDID} \
+         DEBUG=$DEBUG \
+         NORACE=$NORACE \
+         OTHER_IMAGE_TARGETS="" \
+         BINARIES="" \
+         PLUGINS=nri-resctrl-mon \
+         clean install-go-licenses build-plugins-static licenses
+
+FROM gcr.io/distroless/static
+
+COPY --from=builder /go/builder/build/bin/nri-resctrl-mon /bin/nri-resctrl-mon
+COPY --from=builder /go/builder/build/licenses/nri-resctrl-mon/ /licenses/nri-resctrl-mon/
+COPY --from=builder /go/builder/sample-configs/nri-resctrl-mon.yaml /etc/nri/resctrl-mon/config.yaml
+
+ENTRYPOINT ["/bin/nri-resctrl-mon", "-idx", "90", "-config", "/etc/nri/resctrl-mon/config.yaml"]

cmd/plugins/resctrl-mon/main.go

@@ -0,0 +1,90 @@
+// Copyright The NRI Plugins Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"context"
+	"flag"
+	"os"
+
+	"github.com/containerd/nri/pkg/stub"
+	"github.com/sirupsen/logrus"
+)
+
+var (
+	log *logrus.Logger
+)
+
+func main() {
+	var (
+		pluginName  string
+		pluginIdx   string
+		configFile  string
+		verbose     bool
+		veryVerbose bool
+		err         error
+	)
+
+	log = logrus.StandardLogger()
+	log.SetFormatter(&logrus.TextFormatter{
+		PadLevelText: true,
+	})
+
+	flag.StringVar(&pluginName, "name", "", "plugin name to register to NRI")
+	flag.StringVar(&pluginIdx, "idx", "", "plugin index to register to NRI")
+	flag.StringVar(&configFile, "config", "", "configuration file name")
+	flag.BoolVar(&verbose, "v", false, "verbose output")
+	flag.BoolVar(&veryVerbose, "vv", false, "very verbose output")
+	flag.Parse()
+
+	if verbose {
+		log.SetLevel(logrus.DebugLevel)
+	}
+	if veryVerbose {
+		log.SetLevel(logrus.TraceLevel)
+	}
+
+	p := newPlugin()
+
+	if configFile != "" {
+		log.Debugf("reading configuration from %q", configFile)
+		data, err := os.ReadFile(configFile)
+		if err != nil {
+			log.Fatalf("error reading configuration file %q: %s", configFile, err)
+		}
+		if err = p.setConfig(data); err != nil {
+			log.Fatalf("error applying configuration from file %q: %s", configFile, err)
+		}
+	}
+
+	opts := []stub.Option{
+		stub.WithOnClose(p.onClose),
+	}
+	if pluginName != "" {
+		opts = append(opts, stub.WithPluginName(pluginName))
+	}
+	if pluginIdx != "" {
+		opts = append(opts, stub.WithPluginIdx(pluginIdx))
+	}
+
+	if p.stub, err = stub.New(p, opts...); err != nil {
+		log.Fatalf("failed to create plugin stub: %v", err)
+	}
+
+	if err = p.stub.Run(context.Background()); err != nil {
+		log.Errorf("plugin exited (%v)", err)
+		os.Exit(1)
+	}
+}