Update changelog, small doc and name changes

CHANGELOG.asciidoc

@@ -33,7 +33,7 @@ Use subheadings with the "=====" level for adding notes for unreleased changes:
 
 [float]
 ===== Features
-* Context propagation and log correlation now takes place even if recording is disabled - {pull}3358[#3358]
+* Added `context_propagation_only` configuration option - {pull}3358[#3358]
 
 [float]
 ===== Bug fixes

apm-agent-core/src/main/java/co/elastic/apm/agent/impl/ElasticApmTracer.java

@@ -225,7 +225,7 @@ public void onChange(ConfigurationOption<?> configurationOption, Boolean oldValu
 
         this.objectPoolFactory = poolFactory;
         transactionPool = poolFactory.createTransactionPool(maxPooledElements, this);
-        propagationOnlyContextPool = poolFactory.createRemoteParentContextPool(maxPooledElements, this);
+        propagationOnlyContextPool = poolFactory.createPropagationOnlyContextPool(maxPooledElements, this);
         spanPool = poolFactory.createSpanPool(maxPooledElements, this);
 
         // we are assuming that we don't need as many errors as spans or transactions

apm-agent-core/src/main/java/co/elastic/apm/agent/impl/TracerConfiguration.java

@@ -35,9 +35,9 @@ public class TracerConfiguration extends ConfigurationOptionProvider {
             "\n" +
             "A boolean specifying if the agent should be recording or not.\n" +
             "When recording, the agent instruments incoming HTTP requests, tracks errors and collects and sends metrics.\n" +
-            "When not recording, the agent works almost as a noop, not collecting data and not communicating with the APM sever,\n" +
+            "When not recording, the agent works as a noop, not collecting data and not communicating with the APM sever,\n" +
             "except for polling the central configuration endpoint.\n" +
-            "Note that trace context propagation, baggage and log correlation remain active even when recording is disabled.\n"+
+            "Note that trace context propagation, baggage and log correlation will also be disabled when recording is disabled.\n"+
             "As this is a reversible switch, agent threads are not being killed when inactivated, but they will be \n" +
             "mostly idle in this state, so the overhead should be negligible.\n" +
             "\n" +

apm-agent-core/src/main/java/co/elastic/apm/agent/impl/transaction/PropagationOnlyContext.java

@@ -89,6 +89,6 @@ protected void recycle() {
 
     @Override
     public String toString() {
-        return String.format("RemoteParentContext %s (%s)", remoteTraceParent, Integer.toHexString(System.identityHashCode(this)));
+        return String.format("PropagationOnlyContext %s (%s)", remoteTraceParent, Integer.toHexString(System.identityHashCode(this)));
     }
 }

apm-agent-core/src/main/java/co/elastic/apm/agent/objectpool/ObjectPoolFactory.java

@@ -75,7 +75,7 @@ public Transaction createInstance() {
         });
     }
 
-    public ObjectPool<PropagationOnlyContext> createRemoteParentContextPool(int maxCapacity, final ElasticApmTracer tracer) {
+    public ObjectPool<PropagationOnlyContext> createPropagationOnlyContextPool(int maxCapacity, final ElasticApmTracer tracer) {
         return createRecyclableObjectPool(maxCapacity, new Allocator<PropagationOnlyContext>() {
             @Override
             public PropagationOnlyContext createInstance() {