feat(terraform): monolithic flavor support and tfvars presets

terraform/cos/applications.tf

@@ -65,6 +65,10 @@ module "loki" {
   backend_units                     = var.loki_worker.backend_units
   read_units                        = var.loki_worker.read_units
   write_units                       = var.loki_worker.write_units
+  monolithic                        = var.monolithic
+  all_config                        = var.loki_worker.all_config
+  all_worker_storage_directives     = var.loki_worker.all_storage_directives
+  all_units                         = var.loki_worker.all_units
 }
 
 module "mimir" {
@@ -98,6 +102,10 @@ module "mimir" {
   backend_units                     = var.mimir_worker.backend_units
   read_units                        = var.mimir_worker.read_units
   write_units                       = var.mimir_worker.write_units
+  monolithic                        = var.monolithic
+  all_config                        = var.mimir_worker.all_config
+  all_worker_storage_directives     = var.mimir_worker.all_storage_directives
+  all_units                         = var.mimir_worker.all_units
 }
 
 module "opentelemetry_collector" {
@@ -165,6 +173,10 @@ module "tempo" {
   metrics_generator_units                     = var.tempo_worker.metrics_generator_units
   querier_units                               = var.tempo_worker.querier_units
   query_frontend_units                        = var.tempo_worker.query_frontend_units
+  monolithic                                  = var.monolithic
+  all_config                                  = var.tempo_worker.all_config
+  all_worker_storage_directives               = var.tempo_worker.all_storage_directives
+  all_units                                   = var.tempo_worker.all_units
 }
 
 module "traefik" {

terraform/cos/variables.tf

@@ -38,6 +38,12 @@ variable "anti_affinity" {
   default     = true
 }
 
+variable "monolithic" {
+  description = "Deploy coordinated workers in monolithic mode (single role-all worker per signal) instead of separate backend/read/write workers"
+  type        = bool
+  default     = false
+}
+
 # -------------- # TLS configurations --------------
 
 variable "internal_tls" {
@@ -187,6 +193,9 @@ variable "loki_worker" {
     backend_units              = optional(number, 3)
     read_units                 = optional(number, 3)
     write_units                = optional(number, 3)
+    all_config                 = optional(map(string), {})
+    all_storage_directives     = optional(map(string), {})
+    all_units                  = optional(number, 1)
   })
   default     = {}
   description = "Application configuration for all Loki Workers. For more details: https://registry.terraform.io/providers/juju/juju/latest/docs/resources/application"
@@ -217,6 +226,9 @@ variable "mimir_worker" {
     backend_units              = optional(number, 3)
     read_units                 = optional(number, 3)
     write_units                = optional(number, 3)
+    all_config                 = optional(map(string), {})
+    all_storage_directives     = optional(map(string), {})
+    all_units                  = optional(number, 1)
   })
   default     = {}
   description = "Application configuration for all Mimir Workers. For more details: https://registry.terraform.io/providers/juju/juju/latest/docs/resources/application"
@@ -294,6 +306,9 @@ variable "tempo_worker" {
     metrics_generator_units                     = optional(number, 3)
     querier_units                               = optional(number, 3)
     query_frontend_units                        = optional(number, 3)
+    all_config                                  = optional(map(string), {})
+    all_storage_directives                      = optional(map(string), {})
+    all_units                                   = optional(number, 1)
   })
   default     = {}
   description = "Application configuration for all Tempo workers. For more details: https://registry.terraform.io/providers/juju/juju/latest/docs/resources/application"

terraform/scale/distributed.tfvars

@@ -0,0 +1,3 @@
+monolithic    = false
+anti_affinity = true
+risk          = "edge"

terraform/scale/monolithic.tfvars

@@ -0,0 +1,27 @@
+monolithic    = true
+anti_affinity = false
+risk          = "edge"
+
+loki_coordinator = {
+  units = 1
+}
+
+mimir_coordinator = {
+  units = 1
+}
+
+tempo_coordinator = {
+  units = 1
+}
+
+loki_worker = {
+  all_units = 1
+}
+
+mimir_worker = {
+  all_units = 1
+}
+
+tempo_worker = {
+  all_units = 1
+}