Apache Exporter for Prometheus 
Exports apache mod_status statistics via HTTP for Prometheus consumption.
With working golang environment it can be built with go get. There is a good article with build HOWTO and usage example.
Help on flags:
-h, --[no-]help Show context-sensitive help (also try
--help-long and --help-man).
--telemetry.endpoint="/metrics"
Path under which to expose metrics.
--scrape_uri="http://localhost/server-status/?auto"
URI to apache stub status page.
--host_override="" Override for HTTP Host header; empty string for
no override.
--[no-]insecure Ignore server certificate if using https.
--custom_headers Adds custom headers to the collector.
--[no-]web.systemd-socket Use systemd socket activation listeners instead
of port listeners (Linux only).
--web.listen-address=:9117 ...
Addresses on which to expose metrics and web
interface. Repeatable for multiple addresses.
--web.config.file="" [EXPERIMENTAL] Path to configuration file that
can enable TLS or authentication.
--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.
Tested on Apache 2.2 and Apache 2.4.
If your server-status page is secured by http auth, add the credentials to the scrape URL following this example:
http://user:password@localhost/server-status?auto
Override host name by runnning
./apache_exporter --host_override=example.com
Using Docker
Use compose.yml
- Requires Docker CE
- Does not build from source, but rather pulls from registry only
- Edit compose.yml if needed (Maybe to change server-status endpoint)
docker compose up
OR
Build the compatible binary
To make sure that exporter binary created by build job is suitable to run on busybox environment, generate the binary using Makefile definition. Inside project directory run:
make
Please be aware that binary generated using go get or go build with defaults may not work in busybox/alpine base images.
Another option is to use a docker go container to generate the binary.
Pick an appropriate go image from https://hub.docker.com/_/golang. Inside the project directory run:
docker run --rm -v <project home>:/usr/local/go/src/github.com/Lusitaniae/apache_exporter -w /usr/local/go/src/github.com/Lusitaniae/apache_exporter <go docker image name> make
Build image
Run the following commands from the project root directory.
docker build -t apache_exporter .
Run
docker run -d -p 9117:9117 apache_exporter \
--scrape_uri="https://your.server.com/server-status?auto"
Collectors
Apache metrics:
# HELP apache_accesses_total Current total apache accesses (*)
# TYPE apache_accesses_total counter
# HELP apache_scoreboard Apache scoreboard statuses
# TYPE apache_scoreboard gauge
# HELP apache_sent_kilobytes_total Current total kbytes sent (*)
# TYPE apache_sent_kilobytes_total counter
# HELP apache_cpu_load CPU Load (*)
# TYPE apache_cpu_load gauge
# HELP apache_up Could the apache server be reached
# TYPE apache_up gauge
# HELP apache_uptime_seconds_total Current uptime in seconds (*)
# TYPE apache_uptime_seconds_total counter
# HELP apache_workers Apache worker statuses
# TYPE apache_workers gauge
# HELP apache_version Apache server version
# TYPE apache_version gauge
# HELP apache_duration_ms_total Total duration of all registered requests
# TYPE apache_duration_ms_total gauge
Metrics marked '(*)' are only available if ExtendedStatus is On in apache webserver configuration. In version 2.3.6, loading mod_status will toggle ExtendedStatus On by default.
FAQ
Q. Can I change the Dockerfile?
A. In short no, it's not meant for end users. It's part of the CI/CD pipeline in which promu is cross building the exporter for all architectures and packaging them into a Docker image.
Q. Can I run this exporter on different architectures (ARM)?
A. This exporter is cross compiled to all architectures using promu by running promu crossbuild. You can find the resulting artifacts in the release page (Github) or docker images in Quay or Docker.
Q. Is there a Grafana dashboard for this exporter?
A. There's a 3rd party dashboard here which seems to work. Also monitoring-mixin (dashboard+prometheus alerts) is available here.
Q. Can you add additional metrics such as reqpersec, bytespersec and bytesperreq?
A. In line with the best practices, the exporter only provides the totals and you should derive rates using PromQL.
Like that:
ReqPerSec:rate(apache_accesses_total[5m])BytesPerSec:rate(apache_sent_kilobytes_total[5m])BytesPerReq: BytesPerSec / ReqPerSec
Q. Can I monitor multiple Apache instances?
A. In line with the best practices, the answer is no. Each process being monitored should be accompanied by one exporter.
We suggest automating configuration and deployment using your favorite tools, e.g. Ansible/Chef/Kubernetes.
Q. Its not working! Apache_up shows as 0
A. When apache_up reports 0 it means the exporter is running however it is not able to connect to Apache.
Do you have this (or similar) configuration uncommented in your Apache instance?
<Location "/server-status">
SetHandler server-status
Require host example.com
</Location>
As documented at https://httpd.apache.org/docs/2.4/mod/mod_status.html
Are you able to see the stats, if you run this from the Apache instance?
curl localhost/server-status?auto
If you run the exporter manually, do you see any errors?
./apache_exporter
Please include all this information if you still have issues when creating an issue.
Q. There seem to be missing metrics! I can only see apache_up and apache_cpuload.
A. Make sure that you add ?auto at the end of the scrape_uri.
TLS and basic authentication
Apache Exporter supports TLS and basic authentication. This enables better control of the various HTTP endpoints.
To use TLS and/or basic authentication, you need to pass a configuration file
using the --web.config parameter (see above at help on flags). The format of the file is described
in the exporter-toolkit repository.
Note that the TLS and basic authentication settings affect all HTTP endpoints: /metrics for scraping, /probe for probing, and the web UI.
Author
The exporter was originally created by neezgee.