Merge commit '36bca61764984ff5395653cf8377ec5daa71b709' as 'libs/protobuf'

libs/protobuf/kokoro/linux/java_linkage_monitor/build.sh

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+#!/bin/bash
+#
+# This is the top-level script we give to Kokoro as the entry point for
+# running the "pull request" project:
+#
+# This script selects a specific Dockerfile (for building a Docker image) and
+# a script to run inside that image.
+
+use_bazel.sh 4.2.2
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+bazel build //:protoc
+
+# The java build setup expects protoc in the root directory.
+cp bazel-bin/protoc .
+
+cd java
+# Installs the snapshot version locally
+mvn -e -B -Dhttps.protocols=TLSv1.2 install -Dmaven.test.skip=true
+
+# Linkage Monitor uses the snapshot versions installed in $HOME/.m2 to verify compatibility
+JAR=linkage-monitor-latest-all-deps.jar
+curl -v -O "https://storage.googleapis.com/cloud-opensource-java-linkage-monitor/${JAR}"
+# Fails if there's new linkage errors compared with baseline
+java -jar $JAR com.google.cloud:libraries-bom

libs/protobuf/kokoro/linux/java_linkage_monitor/common.cfg

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+# Config file for running Linkage Monitor in Kokoro
+# https://github.com/GoogleCloudPlatform/cloud-opensource-java/tree/master/linkage-monitor
+
+# Location of the build script in repository
+build_file: "protobuf/kokoro/linux/java_linkage_monitor/build.sh"
+timeout_mins: 120
+
+action {
+  define_artifacts {
+    regex: "**/sponge_log.xml"
+  }
+}

libs/protobuf/kokoro/linux/java_linkage_monitor/continuous.cfg

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+# Keep this file empty! Use common.cfg instead.

libs/protobuf/kokoro/linux/java_linkage_monitor/presubmit.cfg

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+# Keep this file empty! Use common.cfg instead.