Fixes #175: Allow configuration of Prometheus time series retention time.

Author: geerlingguy

example.config.yml

@@ -30,6 +30,7 @@ prometheus_monitor_prometheus: false
 prometheus_node_exporter_targets:
   - 'nodeexp:9100'
 prometheus_extra_scrape_configs: ''
+prometheus_tsdb_retention_time: 90d
 
 # Shelly Plug configuration. (Also requires `monitoring_enable`)
 shelly_plug_enable: false

templates/docker-compose.yml.j2

@@ -35,7 +35,7 @@ services:
     command:
       - '--config.file=/etc/prometheus/prometheus.yml'
       - '--storage.tsdb.path=/prometheus'
-      - '--storage.tsdb.retention.time=90d'
+      - '--storage.tsdb.retention.time={{ prometheus_tsdb_retention_time }}'
       - '--web.console.libraries=/usr/share/prometheus/console_libraries'
       - '--web.console.templates=/usr/share/prometheus/consoles'
     ports: