what do you mean by "connecting to IBM bluemix using bosh-cli"?
When you think about the public available IBM Cloud (formerly Bluemix) that's represented here https://console.bluemix.net/ it's not possible. The bosh cli is to maintain the platform, thus Cloudfoundry and potentially other deployments but not your apps.
If you have a private installation you might check the metrics that the system provides. Infos here https://docs.cloudfoundry.org/running/all_metrics.html
When you want to have metrics about your app I could think off your app is providing these metrics. Or you put something in place like the New Relic monitoring. The have a bunch of application performance monitoring (APM). Info here https://docs.newrelic.com/docs/agents
HP