Hi Venkat,
Please use the command pmm-admin remove <service-type> [<service-name>]
You should specify type and name of a service for removing.
Here is an example of removing a mongodb instance.
e.g.
[ec2-user@ip-10-178-1-105 ~]$ pmm-admin list
Service type Service name Address and port Service ID
MongoDB mongodb_node_2 localhost:27021 /service_id/2b9c269b-29e4-479a-94d0-14ac8268b1ad
MongoDB mongodb_node_3 localhost:27026 /service_id/615cb5c8-8545-4694-bc9a-676d32fb2d65
MongoDB mongodb_node_1 localhost:27017 /service_id/e2b5bd94-bd88-498c-937c-b61c885fa916
Agent type Status Agent ID Service ID
pmm_agent Connected /agent_id/bb75578f-f6ea-4b16-8f29-7fc76dc71f01
node_exporter Running /agent_id/15504187-a8c0-4948-89e9-fd8beca42b8f
mongodb_exporter Running /agent_id/f9e15c61-ef75-4251-8bee-23181067ad1f /service_id/e2b5bd94-bd88-498c-937c-b61c885fa916
mongodb_profiler_agent Running /agent_id/3a664850-46c9-4cfa-a50d-bb9b23db97d5 /service_id/e2b5bd94-bd88-498c-937c-b61c885fa916
mongodb_profiler_agent Running /agent_id/b6d5e285-1d00-4037-b476-b52384c05428 /service_id/615cb5c8-8545-4694-bc9a-676d32fb2d65
mongodb_profiler_agent Running /agent_id/baab7571-9598-448b-9d62-52216148eba0 /service_id/2b9c269b-29e4-479a-94d0-14ac8268b1ad
[ec2-user@ip-10-178-1-105 ~]$ pmm-admin remove mongodb mongodb_node_3
Service removed.