Update prometheus.md

docs/prometheus.md

@@ -1,23 +1,22 @@
 # Prometheus
 
-imgproxy can collect its metrics for Prometheus. To use this feature, do the following:
+imgproxy can collect 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. _(optional)_ Set `IMGPROXY_PROMETHEUS_NAMESPACE` to prepend prefix to the names of metrics.
-   I.e. with `IMGPROXY_PROMETHEUS_NAMESPACE=imgproxy` names will look like `imgproxy_requests_total`.
+1. Set the `IMGPROXY_PROMETHEUS_BIND` environment variable to the address and port that will be listened to by the Prometheus server. Note that you can't bind the main server and Prometheus to the same port.
+2. _(optional)_ Set the `IMGPROXY_PROMETHEUS_NAMESPACE` to prepend prefix to the names of metrics, i.e. with `IMGPROXY_PROMETHEUS_NAMESPACE=imgproxy` Names will appear like `imgproxy_requests_total`.
 3. 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);
-* `vips_memory_bytes` - libvips memory usage;
-* `vips_max_memory_bytes` - libvips maximum memory usage;
-* `vips_allocs` - the number of active vips allocations;
-* Some useful Go metrics like memstats and goroutines count.
+* `requests_total`: a counter with the total number of HTTP requests imgproxy has processed
+* `errors_total`: a counter of the occurred errors separated by type (timeout, downloading, processing)
+* `request_duration_seconds`: a histogram of the response latency (in seconds)
+* `download_duration_seconds`: a histogram of the source image downloading latency (in seconds)
+* `processing_duration_seconds`: a histogram of the image processing latency (in seconds)
+* `buffer_size_bytes`: a histogram of the download/gzip buffers sizes (in bytes)
+* `buffer_default_size_bytes`: calibrated default buffer size (in bytes)
+* `buffer_max_size_bytes`: calibrated maximum buffer size (in bytes)
+* `vips_memory_bytes`: libvips memory usage
+* `vips_max_memory_bytes`: libvips maximum memory usage
+* `vips_allocs`: the number of active vips allocations
+* Some useful Go metrics like memstats and goroutines count