Add storage policy

Added storage policy so that deployers can override how to store the logs.
"per_host" stores logs in a sub-directory per host. "per_program" stores logs
in a single file per application which facilitates troubleshooting easy.

Change-Id: I5f71d61549f911ba8ead19e17ea481a4e0fc0262

defaults/main.yml

@@ -22,6 +22,8 @@ rsyslog_server_package_state: "latest"
 rsyslog_server_spool_directory: /var/spool/rsyslog
 rsyslog_server_storage_directory: /var/log/rsyslog
 rsyslog_server_logrotation_window: 14 #Number of days to keep logfiles
+rsyslog_server_storage_policy: "per_host"  ## "per_host" stores logs in a sub-directory per host, "per_program" stores per program
+
 
 # provides UDP syslog reception
 rsyslog_server_udp_reception: true

releasenotes/notes/rsyslog_server_storage_policy-1dcdd5630acdeb79.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - Added storage policy so that deployers can override how to store the logs.
+    ``per_host`` stores logs in a sub-directory per host. ``per_program`` stores logs
+    in a single file per application which facilitates troubleshooting easy.

templates/os_aggregate_storage.j2

@@ -1,4 +1,9 @@
+{% if rsyslog_server_storage_policy == "per_host" %}
 {{ rsyslog_server_storage_directory }}/**/*.log
+{% endif %}
+{% if rsyslog_server_storage_policy == "per_program" %}
+{{ rsyslog_server_storage_directory }}/*.log
+{% endif %}
 {
         copytruncate
         weekly

templates/rsyslog.conf.j2

@@ -31,7 +31,12 @@ $WorkDirectory {{ rsyslog_server_spool_directory }}
 
 
 # Log all remote messages into a sub directory
+{% if rsyslog_server_storage_policy == "per_host" %}
 template(name="DDF" type="string" string="{{ rsyslog_server_storage_directory }}/%hostname%/%programname%.log")
+{% endif %}
+{% if rsyslog_server_storage_policy == "per_program" %}
+template(name="DDF" type="string" string="{{ rsyslog_server_storage_directory }}/%programname%.log")
+{% endif %}
 ruleset(name="remote"){
   *.* -?DDF
 }