imgproxy/docs/prometheus.md

Prometheus

imgproxy can collect its metrics for Prometheus. To use this feature, do the following:

1. Set IMGPROXY_PROMETHEUS_BIND environment variable. Note that you can't bind the main server and Prometheus to the same port;
2. Collect the metrics from any path on the specified binding.

imgproxy will collect the following metrics:

• requests_total - a counter of the total number of HTTP requests imgproxy processed;
• errors_total - a counter of the occurred errors separated by type (timeout, downloading, processing);
• request_duration_seconds - a histogram of the response latency (seconds);
• download_duration_seconds - a histogram of the source image downloading latency (seconds);
• processing_duration_seconds - a histogram of the image processing latency (seconds);
• buffer_size_bytes - a histogram of the download/gzip buffers sizes (bytes);
• buffer_default_size_bytes - calibrated default buffer size (bytes);
• buffer_max_size_bytes - calibrated maximum buffer size (bytes);
• Some useful Go metrics like memstats and goroutines count.