feat(plans): add peadm::add_compiler plan

- Introduced a new plan `peadm::add_compiler` as a proxy for `peadm::add_compilers`.
- Added documentation for the new plan in REFERENCE.md.
- Parameters include `avail_group_letter`, `compiler_host`, `dns_alt_names`, `primary_host`, and `primary_postgresql_host`.
- The plan outputs a deprecation message and calls `peadm::add_compilers` with the provided parameters.

REFERENCE.md

@@ -92,6 +92,7 @@
 
 #### Public Plans
 
+* [`peadm::add_compiler`](#peadm--add_compiler): Proxy plan for peadm::add_compilers.
 * [`peadm::add_compilers`](#peadm--add_compilers): Add new compilers to a PE architecture or replace an existing with new configuration.
 * [`peadm::add_database`](#peadm--add_database)
 * [`peadm::add_replica`](#peadm--add_replica): Add or replace a replica host.
@@ -1594,6 +1595,56 @@ Which port to query the status API on
 
 ## Plans
 
+### <a name="peadm--add_compiler"></a>`peadm::add_compiler`
+
+Proxy plan for peadm::add_compilers.
+
+#### Parameters
+
+The following parameters are available in the `peadm::add_compiler` plan:
+
+* [`avail_group_letter`](#-peadm--add_compiler--avail_group_letter)
+* [`compiler_hosts`](#-peadm--add_compiler--compiler_hosts)
+* [`dns_alt_names`](#-peadm--add_compiler--dns_alt_names)
+* [`primary_host`](#-peadm--add_compiler--primary_host)
+* [`primary_postgresql_host`](#-peadm--add_compiler--primary_postgresql_host)
+
+##### <a name="-peadm--add_compiler--avail_group_letter"></a>`avail_group_letter`
+
+Data type: `Enum['A', 'B']`
+
+_ Either A or B; whichever of the two letter designations the compilers are being assigned to
+
+Default value: `'A'`
+
+##### <a name="-peadm--add_compiler--compiler_hosts"></a>`compiler_hosts`
+
+Data type: `TargetSpec`
+
+_ The hostnames and certnames of the new compilers
+
+##### <a name="-peadm--add_compiler--dns_alt_names"></a>`dns_alt_names`
+
+Data type: `Optional[Array[String[1]]]`
+
+_ An array of strings, where each string is a comma-separated list of DNS alt names for the compilers. Order matters; if a compiler doesn't need dns_alt_names, use "undef" as string.
+
+Default value: `undef`
+
+##### <a name="-peadm--add_compiler--primary_host"></a>`primary_host`
+
+Data type: `Peadm::SingleTargetSpec`
+
+_ The hostname and certname of the primary Puppet server
+
+##### <a name="-peadm--add_compiler--primary_postgresql_host"></a>`primary_postgresql_host`
+
+Data type: `Optional[Peadm::SingleTargetSpec]`
+
+_ The hostname and certname of the PE-PostgreSQL server with availability group $avail_group_letter
+
+Default value: `undef`
+
 ### <a name="peadm--add_compilers"></a>`peadm::add_compilers`
 
 Add new compilers to a PE architecture or replace an existing with new configuration.

plans/add_compiler.pp

@@ -0,0 +1,24 @@
+# @api public
+#
+# @summary Proxy plan for peadm::add_compiler.
+# @param avail_group_letter _ Either A or B; whichever of the two letter designations the compiler are being assigned to
+# @param compiler_host _ The hostname and certname of the new compiler
+# @param dns_alt_names _ A comma-separated list of DNS alt names for the compiler.
+# @param primary_host _ The hostname and certname of the primary Puppet server
+# @param primary_postgresql_host _ The hostname and certname of the PE-PostgreSQL server with availability group $avail_group_letter
+plan peadm::add_compiler(
+  Enum['A', 'B'] $avail_group_letter = 'A' ,
+  Optional[String[1]] $dns_alt_names = undef,
+  Peadm::SingleTargetSpec $compiler_host,
+  Peadm::SingleTargetSpec $primary_host,
+  Optional[Peadm::SingleTargetSpec] $primary_postgresql_host = undef,
+) {
+  out::message('Warning: The add_compiler plan is deprecated and will be removed in a future release. Please use the add_compilers plan instead. ')
+  run_plan('peadm::add_compilers',
+    avail_group_letter      => $avail_group_letter,
+    dns_alt_names           => $dns_alt_names ? { undef => undef, default => Array($dns_alt_names) },
+    compiler_hosts          => $compiler_host,
+    primary_host            => $primary_host,
+    primary_postgresql_host => $primary_postgresql_host,
+  )
+}