Tomcat monitoring is not generic infrastructure monitoring. Tomcat is a JVM application server, which means the signals that predict an outage live in the JVM (heap usage, garbage collection pauses, thread counts) and in Tomcat’s JMX MBeans (connector request counts and processing time, thread pool utilization, active sessions, JDBC connection pools). A tool that watches CPU and memory will tell you the server is sick, but not that currentThreadsBusy is about to hit maxThreads.
The mistake buyers make is picking a dashboard that looks good in a demo but misses the Tomcat-specific failure modes. Thread pool exhaustion under a traffic spike can develop in seconds. A monitor polling every 60 seconds will show you a clean graph right up until requests start queuing.
Three dimensions decide the outcome for most teams:
- Metric depth. Does the tool reach the JMX MBean tree (GlobalRequestProcessor, ThreadPool, Manager, DataSource) or only the Server Status endpoint or JVM-level stats? JDBC pools and servlet-level metrics separate deep tools from shallow ones.
- Resolution. Per-second collection catches transient thread spikes and heap pressure that 15 to 60 second polling averages away.
- Setup cost. Zero-config auto-detection beats enabling JMX Remote, writing exporter YAML, and assembling dashboards by hand.
One note on pricing: we do not quote list prices for any vendor except Netdata. Pricing pages change, negotiated rates differ, and a stale number is worse than no number. Instead, each card describes the pricing shape and what makes the bill grow, with a link to the vendor’s official pricing page. For operator-level detail on the metrics themselves, see our Tomcat monitoring guides. For Netdata’s costs, see our pricing page.