OP#188 add option to allow external remote write in gerenal

manifests/params.pp

@@ -23,7 +23,11 @@
 # @param [String] ps_high_mem soft limit to make kernel reclaim earlier
 # @param [String] ps_swap_mem allow swap, but limit it
 # @param [String] ps_oom_score OOM killer choosing prometheus
-# @param [String] ps_max_procs  reduce parallel WAL replay workers
+# @param [String] ps_max_procs reduce parallel WAL replay workers
+# @param [Boolean] ps_write_external whether to allow remote postgres
+# @param [String] ps_auth_ext_user user for writing to extern instance
+# @param [String] ps_auth_ext_pass password for writing to extern instance
+# @param [String] ps_external_url the full url for the remote write point
 ##############################################################################
 class prometheus_cd::params (
 
@@ -42,11 +46,15 @@ class prometheus_cd::params (
   String $ps_fw_prefix          = '50',
   String $ps_main_port          = '9090',
 
-  # auth
+  # auth prometheus
   String $ps_auth_user          = 'changeme',
   String $ps_auth_pass          = 'changeme',
   String $ps_web_pass           = 'changeme',
 
+  # auth remote
+  String $ps_auth_ext_user      = 'changeme',
+  String $ps_auth_ext_pass      = 'changeme',
+
   # storage
   String $ps_retention_time     = '15d',
   String $ps_retention_size     = '20GB',
@@ -61,6 +69,10 @@ class prometheus_cd::params (
   String $ps_oom_score          = '500',
   String $ps_max_procs          = '1',
 
+  # remote write external
+  Boolean $ps_write_external    = false,
+  String $ps_external_url       = 'http://change.local',
+
 ) {
   # defaults
   $fqdn                   = $facts['networking']['fqdn']