Support to customize the collect period of JVM relative metrics. (#428)

Author: IceSoda177

CHANGES.md

@@ -20,7 +20,8 @@ Release Notes.
 * Add tags `mq.message.keys` and `mq.message.tags` for RocketMQ producer span
 * Clean the trace context which injected into Pulsar MessageImpl after the instance recycled
 * Fix In the higher version of mysql-connector-java 8x, there is an error in the value of db.instance.
-* Add support for KafkaClients 3.2.x
+* Add support for KafkaClients 3.x.
+* Support to customize the collect period of JVM relative metrics.
 
 #### Documentation
 

apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/conf/Config.java

@@ -273,6 +273,10 @@ public static class Jvm {
          * The buffer size of collected JVM info.
          */
         public static int BUFFER_SIZE = 60 * 10;
+        /**
+         * The period in seconds of JVM metrics collection.
+         */
+        public static int METRICS_COLLECT_PERIOD = 1;
     }
 
     public static class Log {

apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/jvm/JVMService.java

@@ -25,6 +25,7 @@
 import org.apache.skywalking.apm.agent.core.boot.DefaultImplementor;
 import org.apache.skywalking.apm.agent.core.boot.DefaultNamedThreadFactory;
 import org.apache.skywalking.apm.agent.core.boot.ServiceManager;
+import org.apache.skywalking.apm.agent.core.conf.Config;
 import org.apache.skywalking.apm.agent.core.jvm.clazz.ClassProvider;
 import org.apache.skywalking.apm.agent.core.jvm.cpu.CPUProvider;
 import org.apache.skywalking.apm.agent.core.jvm.gc.GCProvider;
@@ -66,7 +67,7 @@ public void handle(Throwable t) {
                                                    LOGGER.error("JVMService produces metrics failure.", t);
                                                }
                                            }
-                                       ), 0, 1, TimeUnit.SECONDS);
+                                       ), 0, Config.Jvm.METRICS_COLLECT_PERIOD, TimeUnit.SECONDS);
         sendMetricFuture = Executors.newSingleThreadScheduledExecutor(
             new DefaultNamedThreadFactory("JVMService-consume"))
                                     .scheduleAtFixedRate(new RunnableWithExceptionProtection(

apm-sniffer/config/agent.config

@@ -150,6 +150,8 @@ correlation.value_max_length=${SW_CORRELATION_VALUE_MAX_LENGTH:128}
 correlation.auto_tag_keys=${SW_CORRELATION_AUTO_TAG_KEYS:}
 # The buffer size of collected JVM info.
 jvm.buffer_size=${SW_JVM_BUFFER_SIZE:600}
+# The period in seconds of JVM metrics collection. Unit is second.
+jvm.metrics_collect_period=${SW_JVM_METRICS_COLLECT_PERIOD:1}
 # The buffer channel size.
 buffer.channel_size=${SW_BUFFER_CHANNEL_SIZE:5}
 # The buffer size.

docs/en/setup/service-agent/java-agent/configurations.md

@@ -47,6 +47,7 @@ This is the properties list supported in `agent/config/agent.config`.
 | `correlation.value_max_length`                            | Max value length of each element.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | SW_CORRELATION_VALUE_MAX_LENGTH                                  | `128`                                                                                                                                                                                                                                                                                                                                                                                                                                                |
 | `correlation.auto_tag_keys`                               | Tag the span by the key/value in the correlation context, when the keys listed here exist.                                                                                                                                                                                                                                                                                                                                                                                                                                                             | SW_CORRELATION_AUTO_TAG_KEYS                                     | `""`                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
 | `jvm.buffer_size`                                         | The buffer size of collected JVM info.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | SW_JVM_BUFFER_SIZE                                               | `60 * 10`                                                                                                                                                                                                                                                                                                                                                                                                                                            |
+| `jvm.metrics_collect_period`                              | The period in seconds of JVM metrics collection.  Unit is second.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | SW_JVM_METRICS_COLLECT_PERIOD                                    | `1`                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
 | `buffer.channel_size`                                     | The buffer channel size.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | SW_BUFFER_CHANNEL_SIZE                                           | `5`                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
 | `buffer.buffer_size`                                      | The buffer size.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | SW_BUFFER_BUFFER_SIZE                                            | `300`                                                                                                                                                                                                                                                                                                                                                                                                                                                |
 | `profile.active`                                          | If true, skywalking agent will enable profile when user create a new profile task. Otherwise disable profile.                                                                                                                                                                                                                                                                                                                                                                                                                                          | SW_AGENT_PROFILE_ACTIVE                                          | `true`                                                                                                                                                                                                                                                                                                                                                                                                                                               |