add support for Loki ruler configuration

update also broken Loki documentation link

defaults/main.yml

@@ -75,7 +75,7 @@ loki_runtime_config: []
 loki_table_manager_config:
   retention_deletes_enabled: false
   retention_period: 0s
-
+loki_ruler_config: {}
 
 promtail_client_config:
   - url: "http://{{ loki_listen_address }}:{{ loki_listen_port }}/loki/api/v1/push"
@@ -100,4 +100,4 @@ promtail_scrape_config:
 
 promtail_target_config: []
 promtail_positions_config:
-  filename: /tmp/positions.yaml
+  filename: /tmp/positions.yaml

templates/loki.yml.j2

@@ -1,6 +1,6 @@
 #jinja2: trim_blocks: True, lstrip_blocks: True
 {{ ansible_managed | comment }}
-# https://github.com/grafana/loki/blob/master/docs/configuration/README.md#configuration-file-reference
+# https://grafana.com/docs/loki/latest/configuration/
 
 {% if loki_target != "" %}
 target: {{ loki_target }}
@@ -57,3 +57,7 @@ table_manager:
 runtime_config:
   {{ loki_runtime_config | to_nice_yaml(indent=2) | indent(2, False) }}
 {% endif %}
+{% if loki_ruler_config %}
+ruler:
+  {{ loki_ruler_config | to_nice_yaml(indent=2) | indent(2, False) }}
+{% endif %}