Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Prometheus - An open-source systems monitoring and alerting toolkit.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
Bitrise - Tens of thousands of agencies, startups and enterprise companies with mobile apps - including Runkeeper, Grindr, Duolingo and more - use Bitrise to automate their way to increased productivity & speed