If you're looking for something besides N|Solid, there are plenty of other mature options.
Logz.io is a modern observability platform that aggregates open-source monitoring tools like OpenSearch, Prometheus and OpenTelemetry. It offers log analytics, centralized metrics monitoring and distributed tracing, along with AI-based features for anomaly detection and alert recommendations. The platform is highly scalable and integrates with more than 300 cloud platforms and applications, making it a good choice for finding and fixing problems in production.
Another strong contender is Datadog, an all-in-one monitoring and security platform. It offers real-time insights into performance, security and user experience for any stack and infrastructure. Datadog offers infrastructure monitoring, APM, synthetic monitoring and security monitoring that can help you quickly pinpoint and optimize problems in your systems. It also offers digital experience optimization and software delivery, so it's good for many industries.
If you prefer a platform that's got both security and observability in mind, check out Splunk. It uses AI to boost threat detection, investigation and response, but it also offers full-stack observability with OpenTelemetry support. Splunk is geared for big, complex organizations that need to get problems resolved fast and respond well to security threats. It offers flexible pricing depending on workload types and data ingested, so it's a good choice for enterprise needs.