4. NGINX Amplify Metrics and Metadata
4.1. What Metrics and Metadata are Collected?
NGINX Amplify Agent collects the following types of data:
- NGINX metrics. The agent collects a lot of NGINX related metrics from stub_status, the NGINX Plus status API, the NGINX log files, and from the NGINX process state.
- System metrics. These are various key metrics describing the system, e.g. CPU usage, memory usage, network traffic, etc.
- PHP-FPM metrics. The agent can obtain metrics from the PHP-FPM pool status, if it detects a running PHP-FPM master process.
- NGINX metadata. This is what describes your NGINX instances, and it includes package data, build information, the path to the binary, build configuration options, etc. NGINX metadata also includes the NGINX configuration elements.
- System metadata. This is the basic information about the OS environment where the agent runs. This could be the hostname, uptime, OS flavor, and other data.
The agent will mostly use Python's psutil() to collect the metrics, but occasionally it may also invoke certain system utilities like ps(1). To see the full list of metrics, please check the documentation here.
4.2. How Is the NGINX Configuration Parsed and Analyzed?
The agent is able to automatically find all relevant NGINX configuration files, parse them, extract their logical structure, and send the associated JSON data to the Amplify backend for further analysis and reporting.
To parse SSL certificate metadata the Amplify Agent uses standard openssl(1) functions. SSL certificates are parsed and analyzed only when the corresponding settings are turned on. SSL certificate analysis is off by default.