If it's needed to deploy Azure Log Analytics Solution using Terraform, you can use the following Terraform structure,

resource "azurerm_resource_group" "rg" {
  name     = "rg-sample"
  location = "westus3"
}

resource "azurerm_log_analytics_workspace" "workspace" {
  name                = "alaw-sample"
  location            = "${azurerm_resource_group.rg.location}"
  resource_group_name = "${azurerm_resource_group.rg.name}"
  sku                 = "Free"
}

resource "azurerm_log_analytics_solution" "solution" {
  solution_name         = "ContainerInsights"
  location              = "${azurerm_resource_group.rg.location}"
  resource_group_name   = "${azurerm_resource_group.rg.name}"
  workspace_resource_id = "${azurerm_log_analytics_workspace.workspace.id}"
  workspace_name        = "${azurerm_log_analytics_workspace.workspace.name}"

  plan {
    publisher = "Microsoft"
    product   = "OMSGallery/ContainerInsights"
  }
}

It's possible to deploy an Azure Resource Group, an Azure Log Analytics Workspace and an Azure Log Analytics Solution (for Container Monitoring) using the following command,

terraform init
terraform apply -auto-approve

Unfortunately, list of Azure Log Analytics Solutions is not available in the Terraform provider documentation 😟

Official Terraform Resource Provider page for Azure Log Analytics Solution displays only ContainerInsights example, azurerm_log_analytics_solution

If there is already an Azure Subscription, that has Azure Log Analytics Solutions installed, and it's needed to create a Terraform Module out of it, following command will list the installed Azure Log Analytics Solutions,

# List all log-analytics solutions in the current subscription
az monitor log-analytics solution list

# List all log-analytics solutions for a specific subscription
az monitor log-analytics solution list --subscription ${SUBSCRIPTION_ID}

# List all log-analytics solutions in a resource group
az monitor log-analytics solution list --resource-group ${RESOURCE_GROUP_NAME}

When the command above is executed, it will list the installed Azure Log Analytics Solutions, and it's possible to create a Terraform Module using the output of the command,

resource "azurerm_log_analytics_solution" "solution" {
  solution_name         = "{Product name from the command output}"
  location              = "${azurerm_resource_group.rg.location}"
  resource_group_name   = "${azurerm_resource_group.rg.name}"
  workspace_resource_id = "${azurerm_log_analytics_workspace.workspace.id}"
  workspace_name        = "${azurerm_log_analytics_workspace.workspace.name}"

  plan {
    publisher = "{Publisher name from the command output}"
    product   = "{Product name from the command output}"
  }
}

Note: Before running Azure CLI commands, Log Analytics Solution Extension should be installed; az extension add --name log-analytics-solution