What is APM?

APM stands for Application Performance Monitoring (sometimes Management). The 'application' is the key word — APMs observe the behavior of a running application, not just infrastructure metrics like CPU or memory. A Laravel APM captures every HTTP request, query, job, exception, and scheduled task.

Logs are text lines your application emits. APM is structured telemetry: durations, percentiles, counts, grouped patterns, trace IDs tying related events together. You can query logs; you can monitor with an APM. Most production teams use both — logs for audit and investigation, APM for performance and error trends.

Observability is the broader discipline of understanding a system from its outputs — metrics, logs, traces, events. APM is a product category within observability focused on application-layer performance. Every APM is an observability tool; not every observability tool is an APM.

For a hobby project, no. For a production app with paying users, yes. Without APM you won't know a page is slow until a customer complains, you won't know about exceptions until someone reads the logs, and you'll spend hours investigating issues that a good APM surfaces in seconds.

At minimum: HTTP requests with duration and status, exceptions with fingerprinting, SQL queries with pattern grouping, queued jobs with attempts and failures, scheduled tasks with invocation history, cache hit/miss, outgoing HTTP requests, and logs with trace correlation. The official laravel/nightwatch package covers all of these.