root@percona_mongodb_lab:/usr/local/percona/pmm-client# pmm-admin add mongodb:queries mdb0g-testingdb  --uri mongodb://root:rootpw@127.0.0.1:20010/testingdb
Error adding MongoDB queries: timeout 10s waiting on agent to connect to API.

root@percona_mongodb_lab:/usr/local/percona/pmm-client# cat /var/log/pmm-mongodb-queries-0.log
# Version: percona-qan-agent 1.3.1
# Basedir: /usr/local/percona/qan-agent
# PID:     10560
# API:     172.10.2.23/qan-api
# UUID:    e84f9bbe1c094c0c7b01598a0d425776
2017/10/11 18:17:51.569074 main.go:163: Starting agent...
2017/10/11 18:17:51.584683 main.go:204: API is ready
2017/10/11 18:18:06.199706 main.go:331: Agent is ready

root@percona_mongodb_lab:/usr/local/percona/pmm-client# pmm-admin add mongodb:queries mdb0g-testingdb --uri mongodb://root:rootpw@127.0.0.1:20010/testingdb
We have found system services disconnected from PMM server.
Usually, this happens when data container is wiped before all monitoring services are removed or client is uninstalled.

Orphaned local services: pmm-mongodb-queries-0

To continue, run 'pmm-admin repair' to remove orphaned services.