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# NGINX Prometheus Exporter
NGINX Prometheus exporter makes it possible to monitor NGINX or NGINX Plus using Prometheus.
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## Table of Contents
- [Overview](#overview)
- [Getting Started](#getting-started)
- [A Note about NGINX Ingress Controller](#a-note-about-nginx-ingress-controller)
- [Prerequisites](#prerequisites)
- [Running the Exporter in a Docker Container](#running-the-exporter-in-a-docker-container)
- [Running the Exporter Binary](#running-the-exporter-binary)
- [Usage](#usage)
- [Command-line Arguments](#command-line-arguments)
- [Exported Metrics](#exported-metrics)
- [Common metrics](#common-metrics)
- [Metrics for NGINX OSS](#metrics-for-nginx-oss)
- [Stub status metrics](#stub-status-metrics)
- [Metrics for NGINX Plus](#metrics-for-nginx-plus)
- [Connections](#connections)
- [HTTP](#http)
- [SSL](#ssl)
- [HTTP Server Zones](#http-server-zones)
- [Stream Server Zones](#stream-server-zones)
- [HTTP Upstreams](#http-upstreams)
- [Stream Upstreams](#stream-upstreams)
- [Stream Zone Sync](#stream-zone-sync)
- [Location Zones](#location-zones)
- [Resolver](#resolver)
- [HTTP Requests Rate Limiting](#http-requests-rate-limiting)
- [HTTP Connections Limiting](#http-connections-limiting)
- [Stream Connections Limiting](#stream-connections-limiting)
- [Cache](#cache)
- [Worker](#worker)
- [Troubleshooting](#troubleshooting)
- [Releases](#releases)
- [Docker images](#docker-images)
- [Binaries](#binaries)
- [Homebrew](#homebrew)
- [Snap](#snap)
- [Scoop](#scoop)
- [Nix](#nix)
- [Building the Exporter](#building-the-exporter)
- [Building the Docker Image](#building-the-docker-image)
- [Building the Binary](#building-the-binary)
- [Grafana Dashboard](#grafana-dashboard)
- [SBOM (Software Bill of Materials)](#sbom-software-bill-of-materials)
- [Binaries](#binaries-1)
- [Docker Image](#docker-image)
- [Provenance](#provenance)
- [Contacts](#contacts)
- [Contributing](#contributing)
- [Support](#support)
- [License](#license)
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## Overview
[NGINX](https://nginx.org) exposes a handful of metrics via the [stub_status
page](https://nginx.org/en/docs/http/ngx_http_stub_status_module.html#stub_status). [NGINX
Plus](https://www.nginx.com/products/nginx/) provides a richer set of metrics via the
[API](https://nginx.org/en/docs/http/ngx_http_api_module.html) and the [monitoring
dashboard](https://docs.nginx.com/nginx/admin-guide/monitoring/live-activity-monitoring/). NGINX Prometheus exporter
fetches the metrics from a single NGINX or NGINX Plus, converts the metrics into appropriate Prometheus metrics types
and finally exposes them via an HTTP server to be collected by [Prometheus](https://prometheus.io/).
## Getting Started
In this section, we show how to quickly run NGINX Prometheus Exporter for NGINX or NGINX Plus.
### A Note about NGINX Ingress Controller
If you’d like to use the NGINX Prometheus Exporter with [NGINX Ingress
Controller](https://github.com/nginxinc/kubernetes-ingress/) for Kubernetes, see [this
doc](https://docs.nginx.com/nginx-ingress-controller/logging-and-monitoring/prometheus/) for the installation
instructions.
### Prerequisites
We assume that you have already installed Prometheus and NGINX or NGINX Plus. Additionally, you need to:
- Expose the built-in metrics in NGINX/NGINX Plus:
- For NGINX, expose the [stub_status
page](https://nginx.org/en/docs/http/ngx_http_stub_status_module.html#stub_status) at `/stub_status` on port `8080`.
- For NGINX Plus, expose the [API](https://nginx.org/en/docs/http/ngx_http_api_module.html#api) at `/api` on port
`8080`.
- Configure Prometheus to scrape metrics from the server with the exporter. Note that the default scrape port of the
exporter is `9113` and the default metrics path -- `/metrics`.
### Running the Exporter in a Docker Container
To start the exporter we use the [docker run](https://docs.docker.com/engine/reference/run/) command.
- To export NGINX metrics, run:
```console
docker run -p 9113:9113 nginx/nginx-prometheus-exporter:1.4.0 --nginx.scrape-uri=http://<nginx>:8080/stub_status
```
where `<nginx>` is the IP address/DNS name, through which NGINX is available.
- To export NGINX Plus metrics, run:
```console
docker run -p 9113:9113 nginx/nginx-prometheus-exporter:1.4.0 --nginx.plus --nginx.scrape-uri=http://<nginx-plus>:8080/api
```
where `<nginx-plus>` is the IP address/DNS name, through which NGINX Plus is available.
### Running the Exporter Binary
- To export NGINX metrics, run:
```console
nginx-prometheus-exporter --nginx.scrape-uri=http://<nginx>:8080/stub_status
```
where `<nginx>` is the IP address/DNS name, through which NGINX is available.
- To export NGINX Plus metrics:
```console
nginx-prometheus-exporter --nginx.plus --nginx.scrape-uri=http://<nginx-plus>:8080/api
```
where `<nginx-plus>` is the IP address/DNS name, through which NGINX Plus is available.
- To scrape NGINX metrics with unix domain sockets, run:
```console
nginx-prometheus-exporter --nginx.scrape-uri=unix:<nginx>:/stub_status
```
where `<nginx>` is the path to unix domain socket, through which NGINX stub status is available.
**Note**. The `nginx-prometheus-exporter` is not a daemon. To run the exporter as a system service (daemon), you can
follow the example in [examples/systemd](./examples/systemd/README.md). Alternatively, you can run the exporter
in a Docker container.
## Usage
### Command-line Arguments
```console
usage: nginx-prometheus-exporter [<flags>]
Flags:
-h, --[no-]help Show context-sensitive help (also try --help-long and --help-man).
--[no-]web.systemd-socket Use systemd socket activation listeners instead
of port listeners (Linux only). ($SYSTEMD_SOCKET)
--web.listen-address=:9113 ...
Addresses on which to expose metrics and web interface. Repeatable for multiple addresses. ($LISTEN_ADDRESS)
--web.config.file="" Path to configuration file that can enable TLS or authentication. See: https://github.com/prometheus/exporter-toolkit/blob/master/docs/web-configuration.md ($CONFIG_FILE)
--web.telemetry-path="/metrics"
Path under which to expose metrics. ($TELEMETRY_PATH)
--[no-]nginx.plus Start the exporter for NGINX Plus. By default, the exporter is started for NGINX. ($NGINX_PLUS)
--nginx.scrape-uri=http://127.0.0.1:8080/stub_status ...
A URI or unix domain socket path for scraping NGINX or NGINX Plus metrics. For NGINX, the stub_status page must be available through the URI. For NGINX Plus -- the API. Repeatable for multiple URIs. ($SCRAPE_URI)
--[no-]nginx.ssl-verify Perform SSL certificate verification. ($SSL_VERIFY)
--nginx.ssl-ca-cert="" Path to the PEM encoded CA certificate file used to validate the servers SSL certificate. ($SSL_CA_CERT)
--nginx.ssl-client-cert=""
Path to the PEM encoded client certificate file to use when connecting to the server. ($SSL_CLIENT_CERT)
--nginx.ssl-client-key="" Path to the PEM encoded client certificate key file to use when connecting to the server. ($SSL_CLIENT_KEY)
--nginx.timeout=5s A timeout for scraping metrics from NGINX or NGINX Plus. ($TIMEOUT)
--prometheus.const-label=PROMETHEUS.CONST-LABEL ...
Label that will be used in every metric. Format is label=value. It can be repeated multiple times. ($CONST_LABELS)
--log.level=info Only log messages with the given severity or above. One of: [debug, info, warn, error]
--log.format=logfmt Output format of log messages. One of: [logfmt, json]
--[no-]version Show application version.
```
## Exported Metrics
### Common metrics
| Name | Type | Description | Labels |
| -------------------------------------------- | -------- | -------------------------------------------- | ------------------------------------------------------------------------- |
| `nginx_exporter_build_info` | Gauge | Shows the exporter build information. | `branch`, `goarch`, `goos`, `goversion`, `revision`, `tags` and `version` |
| `promhttp_metric_handler_requests_total` | Counter | Total number of scrapes by HTTP status code. | `code` (the HTTP status code) |
| `promhttp_metric_handler_requests_in_flight` | Gauge | Current number of scrapes being served. | [] |
| `go_*` | Multiple | Go runtime metrics. | [] |
### Metrics for NGINX OSS
| Name | Type | Description | Labels |
| ---------- | ----- | ------------------------------------------------------------------------------------------------ | ------ |
| `nginx_up` | Gauge | Shows the status of the last metric scrape: `1` for a successful scrape and `0` for a failed one | [] |
#### [Stub status metrics](https://nginx.org/en/docs/http/ngx_http_stub_status_module.html)
| Name | Type | Description | Labels |
| ---------------------------- | ------- | ------------------------------------------------------------------- | ------ |
| `nginx_connections_accepted` | Counter | Accepted client connections. | [] |
| `nginx_connections_active` | Gauge | Active client connections. | [] |
| `nginx_connections_handled` | Counter | Handled client connections. | [] |
| `nginx_connections_reading` | Gauge | Connections where NGINX is reading the request header. | [] |
| `nginx_connections_waiting` | Gauge | Idle client connections. | [] |
| `nginx_connections_writing` | Gauge | Connections where NGINX is writing the response back to the client. | [] |
| `nginx_http_requests_total` | Counter | Total http requests. | [] |
### Metrics for NGINX Plus
| Name | Type | Description | Labels |
| -------------- | ----- | ------------------------------------------------------------------------------------------------ | ------ |
| `nginxplus_up` | Gauge | Shows the status of the last metric scrape: `1` for a successful scrape and `0` for a failed one | [] |
#### [Connections](https://nginx.org/en/docs/http/ngx_http_api_module.html#def_nginx_connections)
| Name | Type | Description | Labels |
| -------------------------------- | ------- | ---------------------------------- | ------ |
| `nginxplus_connections_accepted` | Counter | Accepted client connections | [] |
| `nginxplus_connections_active` | Gauge | Active client connections | [] |
| `nginxplus_connections_dropped` | Counter | Dropped client connections dropped | [] |
| `nginxplus_connections_idle` | Gauge | Idle client connections | [] |
#### [HTTP](https://nginx.org/en/docs/http/ngx_http_api_module.html#http_)
| Name | Type | Description | Labels |
| --------------------------------- | ------- | --------------------- | ------ |
| `nginxplus_http_requests_total` | Counter | Total http requests | [] |
| `nginxplus_http_requests_current` | Gauge | Current http requests | [] |
#### [SSL](https://nginx.org/en/docs/http/ngx_http_api_module.html#def_nginx_ssl_object)
| Name | Type | Description | Labels |
| --------------------------------- | ------- | ----------------------------------- | ------ |
| `nginxplus_ssl_handshakes` | Counter | Successful SSL handshakes | [] |
| `nginxplus_ssl_handshakes_failed` | Counter | Failed SSL handshakes | [] |
| `nginxplus_ssl_session_reuses` | Counter | Session reuses during SSL handshake | [] |
#### [HTTP Server Zones](https://nginx.org/en/docs/http/ngx_http_api_module.html#def_nginx_http_server_zone)
| Name | Type | Description | Labels |
| ---------------------------------------- | ------- | -------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------ |
| `nginxplus_server_zone_processing` | Gauge | Client requests that are currently being processed | `server_zone` |
| `nginxplus_server_zone_requests` | Counter | Total client requests | `server_zone` |
| `nginxplus_server_zone_responses` | Counter | Total responses sent to clients | `code` (the response status code. The values are: `1xx`, `2xx`, `3xx`, `4xx` and `5xx`), `server_zone` |
| `nginxplus_server_zone_responses_codes` | Counter | Total responses sent to clients by code | `code` (the response status code. The possible values are [here](https://www.nginx.com/resources/wiki/extending/api/http/)), `server_zone` |
| `nginxplus_server_zone_discarded` | Counter | Requests completed without sending a response | `server_zone` |
| `nginxplus_server_zone_received` | Counter | Bytes received from clients | `server_zone` |
| `nginxplus_server_zone_sent` | Counter | Bytes sent to clients | `server_zone` |
| `nginxplus_server_ssl_handshakes` | Counter | Successful SSL handshakes | `server_zone` |
| `nginxplus_server_ssl_handshakes_failed` | Counter | Failed SSL handshakes | `server_zone` |
| `nginxplus_server_ssl_session_reuses` | Counter | Session reuses during SSL handshake | `server_zone` |
#### [Stream Server Zones](https://nginx.org/en/docs/http/ngx_http_api_module.html#def_nginx_stream_server_zone)
| Name | Type | Description | Labels |
| ----------------------------------------------- | ------- | ----------------------------------------------------- | ----------------------------------------------------------------------------------------- |
| `nginxplus_stream_server_zone_processing` | Gauge | Client connections that are currently being processed | `server_zone` |
| `nginxplus_stream_server_zone_connections` | Counter | Total connections | `server_zone` |
| `nginxplus_stream_server_zone_sessions` | Counter | Total sessions completed | `code` (the response status code. The values are: `2xx`, `4xx`, and `5xx`), `server_zone` |
| `nginxplus_stream_server_zone_discarded` | Counter | Connections completed without creating a session | `server_zone` |
| `nginxplus_stream_server_zone_received` | Counter | Bytes received from clients | `server_zone` |
| `nginxplus_stream_server_zone_sent` | Counter | Bytes sent to clients | `server_zone` |
| `nginxplus_stream_server_ssl_handshakes` | Counter | Successful SSL handshakes | `server_zone` |
| `nginxplus_stream_server_ssl_handshakes_failed` | Counter | Failed SSL handshakes | `server_zone` |
| `nginxplus_stream_server_ssl_session_reuses` | Counter | Session reuses during SSL handshake | `server_zone` |
#### [HTTP Upstreams](https://nginx.org/en/docs/http/ngx_http_api_module.html#def_nginx_http_upstream)
> Note: for the `state` metric, the string values are converted to float64 using the following rule: `"up"` -> `1.0`,
> `"draining"` -> `2.0`, `"down"` -> `3.0`, `"unavail"` –> `4.0`, `"checking"` –> `5.0`, `"unhealthy"` -> `6.0`.
| Name | Type | Description | Labels |
| --------------------------------------------------- | ------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------- |
| `nginxplus_upstream_server_state` | Gauge | Current state | `server`, `upstream` |
| `nginxplus_upstream_server_active` | Gauge | Active connections | `server`, `upstream` |
| `nginxplus_upstream_server_limit` | Gauge | Limit for connections which corresponds to the max_conns parameter of the upstream server. Zero value means there is no limit | `server`, `upstream` |
| `nginxplus_upstream_server_requests` | Counter | Total client requests | `server`, `upstream` |
| `nginxplus_upstream_server_responses` | Counter | Total responses sent to clients | `code` (the response status code. The values are: `1xx`, `2xx`, `3xx`, `4xx` and `5xx`), `server`, `upstream` |
| `nginxplus_upstream_server_responses_codes` | Counter | Total responses sent to clients by code | `code` (the response status code. The possible values are [here](https://www.nginx.com/resources/wiki/extending/api/http/)), `server`, `upstream` |
| nginxplus_upstream_server_sent` | Counter | Bytes sent to this server | `server`, `upstream` |
| `nginxplus_upstream_server_received` | Counter | Bytes received to this server | `server`, `upstream` |
| `nginxplus_upstream_server_fails` | Counter | Number of unsuccessful attempts to communicate with the server | `server`, `upstream` |
| `nginxplus_upstream_server_unavail` | Counter | How many times the server became unavailable for client requests (state 'unavail') due to the number of unsuccessful attempts reaching the max_fails threshold | `server`, `upstream` |
| `nginxplus_upstream_server_header_time` | Gauge | Average time to get the response header from the server | `server`, `upstream` |
| `nginxplus_upstream_server_response_time` | Gauge | Average time to get the full response from the server | `server`, `upstream` |
| `nginxplus_upstream_server_health_checks_checks` | Counter | Total health check requests | `server`, `upstream` |
| `nginxplus_upstream_server_health_checks_fails` | Counter | Failed health checks | `server`, `upstream` |
| `nginxplus_upstream_server_health_checks_unhealthy` | Counter | How many times the server became unhealthy (state 'unhealthy') | `server`, `upstream` |
| `nginxplus_upstream_server_ssl_handshakes` | Counter | Successful SSL handshakes | `server`, `upstream` |
| `nginxplus_upstream_server_ssl_handshakes_failed` | Counter | Failed SSL handshakes | `server`, `upstream` |
| `nginxplus_upstream_server_ssl_session_reuses` | Counter | Session reuses during SSL handshake | `server`, `upstream` |
| `nginxplus_upstream_keepalive` | Gauge | Idle keepalive connections | `upstream` |
| `nginxplus_upstream_zombies` | Gauge | Servers removed from the group but still processing active client requests | `upstream` |
#### [Stream Upstreams](https://nginx.org/en/docs/http/ngx_http_api_module.html#def_nginx_stream_upstream)
> Note: for the `state` metric, the string values are converted to float64 using the following rule: `"up"` -> `1.0`,
> `"down"` -> `3.0`, `"unavail"` –> `4.0`, `"checking"` –> `5.0`, `"unhealthy"` -> `6.0`.
| Name | Type | Description | Labels |
| ---------------------------------------------------------- | ------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------- |
| `nginxplus_stream_upstream_server_state` | Gauge | Current state | `server`, `upstream` |
| `nginxplus_stream_upstream_server_active` | Gauge | Active connections | `server` , `upstream` |
| `nginxplus_stream_upstream_server_limit` | Gauge | Limit for connections which corresponds to the max_conns parameter of the upstream server. Zero value means there is no limit | `server` , `upstream` |
| `nginxplus_stream_upstream_server_connections` | Counter | Total number of client connections forwarded to this server | `server`, `upstream` |
| `nginxplus_stream_upstream_server_connect_time` | Gauge | Average time to connect to the upstream server | `server`, `upstream` |
| `nginxplus_stream_upstream_server_first_byte_time` | Gauge | Average time to receive the first byte of data | `server`, `upstream` |
| `nginxplus_stream_upstream_server_response_time` | Gauge | Average time to receive the last byte of data | `server`, `upstream` |
| `nginxplus_stream_upstream_server_sent` | Counter | Bytes sent to this server | `server`, `upstream` |
| `nginxplus_stream_upstream_server_received` | Counter | Bytes received from this server | `server`, `upstream` |
| `nginxplus_stream_upstream_server_fails` | Counter | Number of unsuccessful attempts to communicate with the server | `server`, `upstream` |
| `nginxplus_stream_upstream_server_unavail` | Counter | How many times the server became unavailable for client connections (state 'unavail') due to the number of unsuccessful attempts reaching the max_fails threshold | `server`, `upstream` |
| `nginxplus_stream_upstream_server_health_checks_checks` | Counter | Total health check requests | `server`, `upstream` |
| `nginxplus_stream_upstream_server_health_checks_fails` | Counter | Failed health checks | `server`, `upstream` |
| `nginxplus_stream_upstream_server_health_checks_unhealthy` | Counter | How many times the server became unhealthy (state 'unhealthy') | `server`, `upstream` |
| `nginxplus_stream_upstream_server_ssl_handshakes` | Counter | Successful SSL handshakes | `server`, `upstream` |
| `nginxplus_stream_upstream_server_ssl_handshakes_failed` | Counter | Failed SSL handshakes | `server`, `upstream` |
| `nginxplus_stream_upstream_server_ssl_session_reuses` | Counter | Session reuses during SSL handshake | `server`, `upstream` |
| `nginxplus_stream_upstream_zombies` | Gauge | Servers removed from the group but still processing active client connections | `upstream` |
#### [Stream Zone Sync](https://nginx.org/en/docs/http/ngx_http_api_module.html#def_nginx_stream_zone_sync)
| Name | Type | Description | Labels |
| ------------------------------------------------- | ------- | ------------------------------------------------------------ | ------ |
| `nginxplus_stream_zone_sync_zone_records_pending` | Gauge | The number of records that need to be sent to the cluster | `zone` |
| `nginxplus_stream_zone_sync_zone_records_total` | Gauge | The total number of records stored in the shared memory zone | `zone` |
| `nginxplus_stream_zone_sync_zone_bytes_in` | Counter | Bytes received by this node | [] |
| `nginxplus_stream_zone_sync_zone_bytes_out` | Counter | Bytes sent by this node | [] |
| `nginxplus_stream_zone_sync_zone_msgs_in` | Counter | Total messages received by this node | [] |
| `nginxplus_stream_zone_sync_zone_msgs_out` | Counter | Total messages sent by this node | [] |
| `nginxplus_stream_zone_sync_zone_nodes_online` | Gauge | Number of peers this node is connected to | [] |
#### [Location Zones](https://nginx.org/en/docs/http/ngx_http_api_module.html#def_nginx_http_location_zone)
| Name | Type | Description | Labels |
| ----------------------------------------- | ------- | --------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------- |
| `nginxplus_location_zone_requests` | Counter | Total client requests | `location_zone` |
| `nginxplus_location_zone_responses` | Counter | Total responses sent to clients | `code` (the response status code. The values are: `1xx`, `2xx`, `3xx`, `4xx` and `5xx`), `location_zone` |
| `nginxplus_location_zone_responses_codes` | Counter | Total responses sent to clients by code | `code` (the response status code. The possible values are [here](https://www.nginx.com/resources/wiki/extending/api/http/)), `location_zone` |
| `nginxplus_location_zone_discarded` | Counter | Requests completed without sending a response | `location_zone` |
| `nginxplus_location_zone_received` | Counter | Bytes received from clients | `location_zone` |
| `nginxplus_location_zone_sent` | Counter | Bytes sent to clients | `location_zone` |
#### [Resolver](https://nginx.org/en/docs/http/ngx_http_api_module.html#def_nginx_resolver_zone)
| Name | Type | Description | Labels |
| ----------------------------- | ------- | ---------------------------------------------- | ---------- |
| `nginxplus_resolver_name` | Counter | Total requests to resolve names to addresses | `resolver` |
| `nginxplus_resolver_srv` | Counter | Total requests to resolve SRV records | `resolver` |
| `nginxplus_resolver_addr` | Counter | Total requests to resolve addresses to names | `resolver` |
| `nginxplus_resolver_noerror` | Counter | Total number of successful responses | `resolver` |
| `nginxplus_resolver_formerr` | Counter | Total number of FORMERR responses | `resolver` |
| `nginxplus_resolver_servfail` | Counter | Total number of SERVFAIL responses | `resolver` |
| `nginxplus_resolver_nxdomain` | Counter | Total number of NXDOMAIN responses | `resolver` |
| `nginxplus_resolver_notimp` | Counter | Total number of NOTIMP responses | `resolver` |
| `nginxplus_resolver_refused` | Counter | Total number of REFUSED responses | `resolver` |
| `nginxplus_resolver_timedout` | Counter | Total number of timed out request | `resolver` |
| `nginxplus_resolver_unknown` | Counter | Total requests completed with an unknown error | `resolver` |
#### [HTTP Requests Rate Limiting](https://nginx.org/en/docs/http/ngx_http_api_module.html#def_nginx_http_limit_req_zone)
| Name | Type | Description | Labels |
| ------------------------------------------ | ------- | --------------------------------------------------------------------------- | ------ |
| `nginxplus_limit_request_passed` | Counter | Total number of requests that were neither limited nor accounted as limited | `zone` |
| `nginxplus_limit_request_rejected` | Counter | Total number of requests that were rejected | `zone` |
| `nginxplus_limit_request_delayed` | Counter | Total number of requests that were delayed | `zone` |
| `nginxplus_limit_request_rejected_dry_run` | Counter | Total number of requests accounted as rejected in the dry run mode | `zone` |
| `nginxplus_limit_request_delayed_dry_run` | Counter | Total number of requests accounted as delayed in the dry run mode | `zone` |
#### [HTTP Connections Limiting](https://nginx.org/en/docs/http/ngx_http_api_module.html#def_nginx_http_limit_conn_zone)
| Name | Type | Description | Labels |
| --------------------------------------------- | ------- | ------------------------------------------------------------------------------ | ------ |
| `nginxplus_limit_connection_passed` | Counter | Total number of connections that were neither limited nor accounted as limited | `zone` |
| `nginxplus_limit_connection_rejected` | Counter | Total number of connections that were rejected | `zone` |
| `nginxplus_limit_connection_rejected_dry_run` | Counter | Total number of connections accounted as rejected in the dry run mode | `zone` |
#### [Stream Connections Limiting](https://nginx.org/en/docs/http/ngx_http_api_module.html#def_nginx_stream_limit_conn_zone)
| Name | Type | Description | Labels |
| ---------------------------------------------------- | ------- | ------------------------------------------------------------------------------ | ------ |
| `nginxplus_stream_limit_connection_passed` | Counter | Total number of connections that were neither limited nor accounted as limited | `zone` |
| `nginxplus_stream_limit_connection_rejected` | Counter | Total number of connections that were rejected | `zone` |
| `nginxplus_stream_limit_connection_rejected_dry_run` | Counter | Total number of connections accounted as rejected in the dry run mode | `zone` |
#### [Cache](https://nginx.org/en/docs/http/ngx_http_api_module.html#def_nginx_http_cache)
| Name | Type | Description | Labels |
| ------------------------------------------- | ------- | ----------------------------------------------------------------------- | ------- |
| `nginxplus_cache_size` | Gauge | Total size of the cache | `cache` |
| `nginxplus_cache_max_size` | Gauge | Maximum size of the cache | `cache` |
| `nginxplus_cache_cold` | Gauge | Is the cache considered cold | `cache` |
| `nginxplus_cache_hit_responses` | Counter | Total number of cache hits | `cache` |
| `nginxplus_cache_hit_bytes` | Counter | Total number of bytes returned from cache hits | `cache` |
| `nginxplus_cache_stale_responses` | Counter | Total number of stale cache hits | `cache` |
| `nginxplus_cache_stale_bytes` | Counter | Total number of bytes returned from stale cache hits | `cache` |
| `nginxplus_cache_updating_responses` | Counter | Total number of cache hits while cache is updating | `cache` |
| `nginxplus_cache_updating_bytes` | Counter | Total number of bytes returned from cache while cache is updating | `cache` |
| `nginxplus_cache_revalidated_responses` | Counter | Total number of cache revalidations | `cache` |
| `nginxplus_cache_revalidated_bytes` | Counter | Total number of bytes returned from cache revalidations | `cache` |
| `nginxplus_cache_miss_responses` | Counter | Total number of cache misses | `cache` |
| `nginxplus_cache_miss_bytes` | Counter | Total number of bytes returned from cache misses | `cache` |
| `nginxplus_cache_expired_responses` | Counter | Total number of cache hits with expired TTL | `cache` |
| `nginxplus_cache_expired_bytes` | Counter | Total number of bytes returned from cache hits with expired TTL | `cache` |
| `nginxplus_cache_expired_responses_written` | Counter | Total number of cache hits with expired TTL written to cache | `cache` |
| `nginxplus_cache_expired_bytes_written` | Counter | Total number of bytes written to cache from cache hits with expired TTL | `cache` |
| `nginxplus_cache_bypass_responses` | Counter | Total number of cache bypasses | `cache` |
| `nginxplus_cache_bypass_bytes` | Counter | Total number of bytes returned from cache bypasses | `cache` |
| `nginxplus_cache_bypass_responses_written` | Counter | Total number of cache bypasses written to cache | `cache` |
| `nginxplus_cache_bypass_bytes_written` | Counter | Total number of bytes written to cache from cache bypasses | `cache` |
#### [Worker](https://nginx.org/en/docs/http/ngx_http_api_module.html#def_nginx_worker)
| Name | Type | Description | Labels |
| ---------------------------------------- | ------- | ------------------------------------------------------------------------ | ----------- |
| `nginxplus_worker_connection_accepted` | Counter | The total number of accepted client connections | `id`, `pid` |
| `nginxplus_worker_connection_dropped` | Counter | The total number of dropped client connections | `id`, `pid` |
| `nginxplus_worker_connection_active` | Gauge | The current number of active client connections | `id`, `pid` |
| `nginxplus_worker_connection_idle` | Gauge | The current number of idle client connection | `id`, `pid` |
| `nginxplus_worker_http_requests_total` | Counter | The total number of client requests received | `id`, `pid` |
| `nginxplus_worker_http_requests_current` | Gauge | The current number of client requests that are currently being processed | `id`, `pid` |
Connect to the `/metrics` page of the running exporter to see the complete list of metrics along with their
descriptions. Note: to see server zones related metrics you must configure [status
zones](https://nginx.org/en/docs/http/ngx_http_api_module.html#status_zone) and to see upstream related metrics you
must configure upstreams with a [shared memory zone](https://nginx.org/en/docs/http/ngx_http_upstream_module.html#zone).
## Troubleshooting
The exporter logs errors to the standard output. When using Docker, if the exporter doesn’t work as expected, check its
logs using [docker logs](https://docs.docker.com/engine/reference/commandline/logs/) command.
## Releases
### Docker images
We publish the Docker image on [DockerHub](https://hub.docker.com/r/nginx/nginx-prometheus-exporter/),
[GitHub Container](https://github.com/nginxinc/nginx-prometheus-exporter/pkgs/container/nginx-prometheus-exporter),
[Amazon ECR Public Gallery](https://gallery.ecr.aws/nginx/nginx-prometheus-exporter) and
[Quay.io](https://quay.io/repository/nginx/nginx-prometheus-exporter).
As an alternative, you can choose the _edge_ version built from the [latest commit](https://github.com/nginxinc/nginx-prometheus-exporter/commits/main)
from the main branch. The edge version is useful for experimenting with new features that are not yet published in a
stable release.
### Binaries
We publish the binaries for multiple Operating Systems and architectures on the GitHub [releases page](https://github.com/nginxinc/nginx-prometheus-exporter/releases).
### Homebrew
You can add the NGINX homebrew tap with
```console
brew tap nginxinc/tap
```
and then install the formula with
```console
brew install nginx-prometheus-exporter
```
### Snap
You can install the NGINX Prometheus Exporter from the [Snap Store](https://snapcraft.io/nginx-prometheus-exporter).
```console
snap install nginx-prometheus-exporter
```
### Scoop
You can add the NGINX Scoop bucket with
```console
scoop bucket add nginx https://github.com/nginxinc/scoop-bucket.git
```
and then install the package with
```console
scoop install nginx-prometheus-exporter
```
### Nix
First include NUR in your packageOverrides as explained in the [NUR documentation](https://github.com/nix-community/NUR#installation).
Then you can use the exporter with the following command:
```console
nix-shell --packages nur.repos.nginx.nginx-prometheus-exporter
```
or install it with:
```console
nix-env -f '<nixpkgs>' -iA nur.repos.nginx.nginx-prometheus-exporter
```
## Building the Exporter
You can build the exporter using the provided Makefile. Before building the exporter, make sure the following software
is installed on your machine:
- make
- git
- Docker for building the container image
- Go for building the binary
### Building the Docker Image
To build the Docker image with the exporter, run:
```console
make container
```
Note: go is not required, as the exporter binary is built in a Docker container. See the [Dockerfile](build/Dockerfile).
### Building the Binary
To build the binary, run:
```console
make
```
Note: the binary is built for the OS/arch of your machine. To build binaries for other platforms, see the
[Makefile](Makefile).
The binary is built with the name `nginx-prometheus-exporter`.
## Grafana Dashboard
The official Grafana dashboard is provided with the exporter for NGINX. Check the [Grafana
Dashboard](./grafana/README.md) documentation for more information.
## SBOM (Software Bill of Materials)
We generate SBOMs for the binaries and the Docker image.
### Binaries
The SBOMs for the binaries are available in the releases page. The SBOMs are generated using
[syft](https://github.com/anchore/syft) and are available in SPDX format.
### Docker Image
The SBOM for the Docker image is available in the
[DockerHub](https://hub.docker.com/r/nginx/nginx-prometheus-exporter),
[GitHub Container registry](https://github.com/nginxinc/nginx-prometheus-exporter/pkgs/container/nginx-prometheus-exporter),
[Amazon ECR Public Gallery](https://gallery.ecr.aws/nginx/nginx-prometheus-exporter) and
[Quay.io](https://quay.io/repository/nginx/nginx-prometheus-exporter) repositories. The SBOMs are generated using
[syft](https://github.com/anchore/syft) and stored as an attestation in the image manifest.
For example to retrieve the SBOM for `linux/amd64` from Docker Hub and analyze it using
[grype](https://github.com/anchore/grype) you can run the following command:
```console
docker buildx imagetools inspect nginx/nginx-prometheus-exporter:edge --format '{{ json (index .SBOM "linux/amd64").SPDX }}' | grype
```
## Provenance
We generate provenance for the Docker image and it's available in the
[DockerHub](https://hub.docker.com/r/nginx/nginx-prometheus-exporter),
[GitHub Container registry](https://github.com/nginxinc/nginx-prometheus-exporter/pkgs/container/nginx-prometheus-exporter),
[Amazon ECR Public Gallery](https://gallery.ecr.aws/nginx/nginx-prometheus-exporter) and
[Quay.io](https://quay.io/repository/nginx/nginx-prometheus-exporter) repositories, stored as an attestation in the
image manifest.
For example to retrieve the provenance for `linux/amd64` from Docker Hub you can run the following command:
```console
docker buildx imagetools inspect nginx/nginx-prometheus-exporter:edge --format '{{ json (index .Provenance "linux/amd64").SLSA }}'
```
## Contacts
We’d like to hear your feedback! If you have any suggestions or experience issues with the NGINX Prometheus Exporter,
please create an issue or send a pull request on GitHub. You can contact us directly via <integrations@nginx.com> or on
the [NGINX Community Slack](https://nginxcommunity.slack.com/channels/nginx-prometheus-exporter) in the
`#nginx-prometheus-exporter` channel.
## Contributing
If you'd like to contribute to the project, please read our [Contributing guide](CONTRIBUTING.md).
## Support
The commercial support is available for NGINX Plus customers when the NGINX Prometheus Exporter is used with NGINX
Ingress Controller.
## License
[Apache License, Version 2.0](LICENSE).
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