Add agent self-observability. #2029

Job	Run time
Build	7m 16s
okhttp-scenario	1m 7s
play-scenario	1m 8s
postgresql-scenario	45s
pulsar-scenario	1m 6s
rabbitmq-scenario	1m 6s
redisson-scenario	1m 10s
resttemplate-4.x-scenario	1m 5s
servicecomb-1.x-scenario	1m 9s
servicecomb-2.x-scenario	53s
shardingsphere-3.x-scenario	1m 5s
shardingsphere-4.0.x-scenario	1m 5s
shardingsphere-4.x-scenario	1m 4s
shardingsphere-5.0.0-scenario	1m 4s
sofarpc-scenario	1m 5s
solrj-7.x-scenario	52s
spring-3.0.x-scenario	1m 8s
spring-cloud-feign-1.1.x-scenario	53s
spring-cloud-feign-1.2.x-scenario	1m 7s
spring-cloud-feign-2.x-scenario	1m 5s
spring-tx-scenario	1m 11s
struts2.3-scenario	1m 5s
struts2.5-scenario	52s
cxf-scenario	1m 6s
okhttp2-scenario	1m 6s
rocketmq-scenario	56s
jersey-2.0.x-2.25.x-scenario	56s
jersey-2.26.x-2.39.x-scenario	1m 8s
websphere-liberty-23.x-scenario	51s
nacos-client-2.x-scenario	51s
rocketmq-5-grpc-scenario	56s
	38m 11s

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