From 574f57c82cb44a6dce204fbdfda197753d8752de Mon Sep 17 00:00:00 2001
From: Aine <aine@etke.cc>
Date: Sun, 26 Jun 2022 08:41:22 +0300
Subject: [PATCH] expose prometheus process args

---
 roles/matrix-prometheus/defaults/main.yml                  | 7 +++++++
 .../templates/systemd/matrix-prometheus.service.j2         | 3 ++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/roles/matrix-prometheus/defaults/main.yml b/roles/matrix-prometheus/defaults/main.yml
index cb1e6c014..ffe2ddc0e 100644
--- a/roles/matrix-prometheus/defaults/main.yml
+++ b/roles/matrix-prometheus/defaults/main.yml
@@ -26,6 +26,13 @@ matrix_prometheus_systemd_wanted_services_list: []
 # Takes an "<ip>:<port>" or "<port>" value (e.g. "127.0.0.1:9090"), or empty string to not expose.
 matrix_prometheus_container_http_host_bind_port: ''
 
+# A list of extra arguments to pass to the prometheus process
+matrix_prometheus_process_extra_arguments:
+  - "--config.file=/etc/prometheus/prometheus.yml"
+  - "--storage.tsdb.path=/prometheus"
+  - "--web.console.libraries=/usr/share/prometheus/console_libraries"
+  - "--web.console.templates=/usr/share/prometheus/consoles"
+
 # Tells whether the "synapse" scraper configuration is enabled.
 matrix_prometheus_scraper_synapse_enabled: false
 
diff --git a/roles/matrix-prometheus/templates/systemd/matrix-prometheus.service.j2 b/roles/matrix-prometheus/templates/systemd/matrix-prometheus.service.j2
index 8de57201c..296a3adf0 100644
--- a/roles/matrix-prometheus/templates/systemd/matrix-prometheus.service.j2
+++ b/roles/matrix-prometheus/templates/systemd/matrix-prometheus.service.j2
@@ -31,7 +31,8 @@ ExecStart={{ matrix_host_command_docker }} run --rm --name matrix-prometheus \
 			{% for arg in matrix_prometheus_container_extra_arguments %}
 			{{ arg }} \
 			{% endfor %}
-			{{ matrix_prometheus_docker_image }}
+			{{ matrix_prometheus_docker_image }} \
+			{{ matrix_prometheus_process_extra_arguments|join(' ') }}
 
 ExecStop=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} kill matrix-prometheus 2>/dev/null || true'
 ExecStop=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} rm matrix-prometheus 2>/dev/null || true'