aws-rds datasource produces incomprehensible branch, commit, and MR names

[z0rc]

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service-messaging-center.tf:

module "rds_messaging_center" {
  source  = "terraform-aws-modules/rds/aws"
  version = "6.10.0"

  identifier = "${terraform.workspace}-messaging-center"

  instance_class = local.messaging_center_rds_arguments.instance_class

  engine         = "postgres"
  engine_version = "16.3"

  family     = "postgres16"
  parameters = local.messaging_center_rds_arguments.parameters

  port = 5432

  allocated_storage     = local.messaging_center_rds_arguments.allocated_storage
  max_allocated_storage = local.messaging_center_rds_arguments.max_allocated_storage
  storage_type          = "gp3"
  storage_encrypted     = true

  vpc_security_group_ids = [module.sg_rds_messaging_center.security_group_id]
  create_db_subnet_group = false
  db_subnet_group_name   = data.aws_db_subnet_group.current.name
  multi_az               = local.messaging_center_rds_arguments.multi_az

  username                    = "rds_messaging_center_master_user"
  manage_master_user_password = false
  password                    = random_password.rds_messaging_center_master_password.result

  maintenance_window = "Sun:00:00-Sun:02:00"

  performance_insights_enabled          = true
  performance_insights_retention_period = 7

  create_monitoring_role = true
  monitoring_role_name   = "${terraform.workspace}-messaging-center-rds-monitoring"
  monitoring_interval    = 60

  create_cloudwatch_log_group            = true
  enabled_cloudwatch_logs_exports        = ["postgresql", "upgrade"]
  cloudwatch_log_group_retention_in_days = 7
}

renovate.json:

{
  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
  "extends": ["config:recommended"],
  "customManagers": [
    {
      "customType": "regex",
      "fileMatch": [
        "service-.*\\.tf$"
      ],
      "matchStrings": [
        "engine\\s*=\\s*\"postgres\"\\s*engine_version\\s*=\\s*\"(?<currentValue>\\d*\\.\\d*)\""
      ],
      "datasourceTemplate": "aws-rds",
      "packageNameTemplate": "[{\"Name\":\"engine\",\"Values\":[\"postgres\"]}]",
      "versioningTemplate": "semver-coerced"
    }
  ]
}

This produces:

• branch name feature/renovate-{"name"-"engine","values"-"postgres"-}-16.x
• commit message chore: [deps] Update dependency [{"Name":"engine","Values":["postgres"]}] to v16.5
• MR name chore: [deps] Update dependency [{"Name":"engine","Values":["postgres"]}] to v16.5

I probably can override branchTopic and commitMessageTopic via packageRules, but looking for external input, as suggested in documentation.

Logs (if relevant)

Logs

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[z0rc]

I decided to do the following:

  "packageRules": [
    {
      "matchDatasources": [
        "aws-rds"
      ],
      "branchTopic": "aws-rds-postgres-{{{newMajor}}}.x",
      "commitMessageTopic": "AWS RDS Postgres engine version"
    }
  ]

Which works for my case, but it isn't a universal solution.