modify metric name (#86)

Author: innerpeacez

agent-plugins/agent-cpu-plugin/src/main/java/cloud/erda/agent/plugin/cpu/ProcessCPUUsageProvider.java

@@ -24,7 +24,7 @@
 
 public class ProcessCPUUsageProvider implements CPUDefaultProvider {
 
-    private static final String METRIC_NAME = "process_cpu_usage";
+    private static final String METRIC_NAME = "jvm_process_cpu_usage";
     private final ThreadMXBean threadBean;
     boolean isFirst = true;
     private long preNanoTime = System.nanoTime();