jbonofre's blog

Apache Karaf Decanter 2.4.0 will be released soon and include a set of new collectors. Oshi Collector The oshi collector harvest a bunch of data about the hardware and the operating system. It’s a scheduled collector, executed periodically (every minute by default). You can have all details about the machine thanks to this collector: motherboard, cpu, sensors, disks, etc, etc. By default, the oshi collector retrieves all details, but you can filter what you want to harvest in the etc/org.apache.karaf.decanter.collector.oshi.cfg configuration file. It means now we have the system collector that allows you to periodically execute scripts and shell commands, and the oshi collector that harvests all details about the system. ConfigAdmin Collector The ConfigAdmin collector is a event driven collector. It “listens” for any change on the Karaf configuration and send an event for each change. Prometheus Collector Karaf Decanter 2.3.0 introduced the Prometheus appender to expo...

As said in my previous post, Apache Karaf Decanter 2.3.0 is a major new release bringing fixes, improvements and new features. We saw the new alerting service. In this blog post, we see another new feature: the Prometheus Appender. Prometheus ? Prometheus ( https://prometheus.io/ ) is a popular metrics toolkit, especially for cloud ecosystem. It’s open-source and it’s part of the Cloud Native Computing Foundation. If Karaf Decanter provides similar collecting and alerting features, it makes sense to use Decanter as collector that Prometheus can request. Then, the visualization and search can be performed on Prometheus. Decanter Prometheus Appender The preferred approach with Prometheus is to “expose” a HTTP endpoint providing metrics that the Prometheus platform can retrieve. It’s what the Decanter Prometheus Appender is doing: bind a Prometheus servlet that Prometheus can “poll” get the incoming data from the Decanter Collectors detects the num...