oap-server/server-receiver-plugin/envoy-metrics-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/envoy/EnvoyMetricReceiverProvider.java [81:107]:
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        if (config.getGRPCPort() != 0 && !RunningMode.isInitMode()) {
            if (config.isGRPCSslEnabled()) {
                grpcServer = new GRPCServer(
                    Strings.isBlank(config.getGRPCHost()) ? "0.0.0.0" : config.getGRPCHost(),
                    config.getGRPCPort(),
                    config.getGRPCSslCertChainPath(),
                    config.getGRPCSslKeyPath(),
                    config.getGRPCSslTrustedCAsPath()
                );
            } else {
                grpcServer = new GRPCServer(
                    Strings.isBlank(config.getGRPCHost()) ? "0.0.0.0" : config.getGRPCHost(),
                    config.getGRPCPort()
                );
            }
            if (config.getMaxMessageSize() > 0) {
                grpcServer.setMaxMessageSize(config.getMaxMessageSize());
            }
            if (config.getMaxConcurrentCallsPerConnection() > 0) {
                grpcServer.setMaxConcurrentCallsPerConnection(config.getMaxConcurrentCallsPerConnection());
            }
            if (config.getGRPCThreadPoolSize() > 0) {
                grpcServer.setThreadPoolSize(config.getGRPCThreadPoolSize());
            }
            grpcServer.initialize();

            this.receiverGRPCHandlerRegister = new GRPCHandlerRegisterImpl(grpcServer);
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oap-server/server-receiver-plugin/skywalking-ebpf-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/ebpf/provider/EBPFReceiverProvider.java [86:112]:
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        if (config.getGRPCPort() != 0 && !RunningMode.isInitMode()) {
            if (config.isGRPCSslEnabled()) {
                grpcServer = new GRPCServer(
                    Strings.isBlank(config.getGRPCHost()) ? "0.0.0.0" : config.getGRPCHost(),
                    config.getGRPCPort(),
                    config.getGRPCSslCertChainPath(),
                    config.getGRPCSslKeyPath(),
                    config.getGRPCSslTrustedCAsPath()
                );
            } else {
                grpcServer = new GRPCServer(
                    Strings.isBlank(config.getGRPCHost()) ? "0.0.0.0" : config.getGRPCHost(),
                    config.getGRPCPort()
                );
            }
            if (config.getMaxMessageSize() > 0) {
                grpcServer.setMaxMessageSize(config.getMaxMessageSize());
            }
            if (config.getMaxConcurrentCallsPerConnection() > 0) {
                grpcServer.setMaxConcurrentCallsPerConnection(config.getMaxConcurrentCallsPerConnection());
            }
            if (config.getGRPCThreadPoolSize() > 0) {
                grpcServer.setThreadPoolSize(config.getGRPCThreadPoolSize());
            }
            grpcServer.initialize();

            this.receiverGRPCHandlerRegister = new GRPCHandlerRegisterImpl(grpcServer);
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