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Answer : Probably the default scrape_timeout value is too short for you [ scrape_timeout: <duration> | default = 10s ] Set a bigger value for scrape_timeout. scrape_configs: - job_name: 'prometheus' scrape_interval: 5m scrape_timeout: 1m Take a look here https://github.com/prometheus/prometheus/issues/1438 I had a same problem in the past. In my case the problem was with the certificates and I fixed it with adding: tls_config: insecure_skip_verify: true You can try it, maybe it will work.

Answer : jconsole just provides a wrapper around the JMX MBeans that are in the platform MBeanServer . You can write a program to connect to your VM using the Attach API which would then query the MBeans. Or you can expose the platform MBeanServer over RMI and query the MBeans that way. See the java.lang.management package for more info Maybe jvmtop is worth a look. It's a command-line tool which provides a live-view for several metrics. Example output of the VM overview mode: JvmTop 0.4.1 amd64 8 cpus, Linux 2.6.32-27, load avg 0.12 http://code.google.com/p/jvmtop PID MAIN-CLASS HPCUR HPMAX NHCUR NHMAX CPU GC VM USERNAME #T DL 3370 rapperSimpleApp 165m 455m 109m 176m 0.12% 0.00% S6U37 web 21 11272 ver.resin.Resin [ERROR: Could not attach to VM] 27338 WatchdogManager 11m 28m 23m 130m 0.00% 0.00% S6U37 web 31 19187 m.jvmtop.JvmTop 20m 3544m 13m 130m 0.93% 0.47% S6U37 web 20 16733 artup.Bootstrap 159m...