r/f-b-arr: Configure Fluent Bit for Servarr logs

The _fluent-bit-servarr_ role creates a configuration file for Fluent
Bit to read and parse logs from Radarr, Sonarr, and Prowlarr.  These
logs can then be sent to an output by defining the
`fluent_bit_servarr_outputs` variable.

roles/fluent-bit-servarr/defaults/main.yml

@@ -0,0 +1 @@
+fluent_bit_servarr_outputs: []

roles/fluent-bit-servarr/handlers/main.yml

@@ -0,0 +1,4 @@
+- name: restart fluent-bit
+  service:
+    name: fluent-bit
+    state: restarted

roles/fluent-bit-servarr/meta/main.yml

@@ -0,0 +1,2 @@
+dependencies:
+- role: systemd-base

roles/fluent-bit-servarr/tasks/main.yml

@@ -0,0 +1,12 @@
+- name: ensure fluent-bit configuration for servarr is in place
+  copy:
+    content: |+
+      {{ fluent_bit_servarr_config | to_nice_yaml(indent=2) }}
+    dest: /etc/fluent-bit/include/servarr.yml
+    mode: u=rw,go=r
+    owner: root
+    group: root
+  notify:
+  - restart fluent-bit
+  tags:
+  - config

roles/fluent-bit-servarr/vars/main.yml

@@ -0,0 +1,45 @@
+servarr_logs:
+- /var/log/prowlarr/*.txt
+- /var/log/radarr/*.txt
+- /var/log/sonarr/*.txt
+
+fluent_bit_servarr_config:
+  multiline_parsers:
+  - name: multiline_servarr
+    type: regex
+    flush_timeout: 500
+    rules:
+    - state: start_state
+      regex: ^\d{4}-\d{2}-\d{2} [ 0-2]?\d:\d{2}:\d{2}\.\d+\|
+      next_state: cont
+    - state: cont
+      regex: ^(?!\d{4}-\d{2}-\d{2} [ 0-2]?\d:\d{2}:\d{2}\.\d+\|).*
+      next_state: cont
+
+  parsers:
+  - name: servarr
+    format: regex
+    regex: /^(?<timestamp>\d{4}-\d{2}-\d{2} [ 0-2]?\d:\d{2}:\d{2}\.\d+)\|(?<level>[^|]+)\|(?<logger>[^|]+)\|(?<log>.*)/m
+    time_key: timestamp
+    time_format: '%Y-%m-%d %H:%M:%S.%L'
+
+  pipeline:
+    inputs:
+    - name: tail
+      alias: servarr
+      tag: servarr
+      path: '{{ servarr_logs | join(",") }}'
+      path_key: filename
+      multiline.parser: multiline_servarr
+      db: /var/lib/fluent-bit/servarr.db
+      read_from_head: true
+
+    filters:
+    - name: parser
+      alias: servarr
+      match: servarr
+      key_name: log
+      parser: servarr
+      reserve_data: true
+
+    outputs: '{{ fluent_bit_servarr_outputs }}'

servarr.yml

@@ -1,3 +1,9 @@
 - import_playbook: prowlarr.yml
 - import_playbook: radarr.yml
 - import_playbook: sonarr.yml
+
+- hosts: servarr
+  roles:
+  - role: fluent-bit-servarr
+    tags:
+    - fluent-bit