aws_bedrockagentcore_agent_runtime: Fix lifecycle_configuration attributes to be properly computed when not specified

[marcinbelczewski]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

No changes to security controls.

Description

Fixes the aws_bedrockagentcore_agent_runtime resource to properly handle computed default values for lifecycle_configuration attributes.

When using lifecycle_configuration with only max_lifetime specified (without idle_runtime_session_timeout), AWS automatically computes a default value for idle_runtime_session_timeout. The previous implementation used schema.ListAttribute which only marked the list as Optional+Computed, but the nested attributes were not marked as Computed. This caused Terraform to report "Provider produced inconsistent result after apply" when the API returned computed values.

The fix converts lifecycle_configuration from a schema.ListAttribute to a schema.ListNestedBlock where both idle_runtime_session_timeout and max_lifetime are explicitly marked as Optional: true, Computed: true. This allows the AWS API to return computed default values without triggering the inconsistent result error.

Relations

Closes #45290

References

• Terraform Plugin Framework - Computed Attributes

Output from Acceptance Testing

% make testacc TESTS=TestAccBedrockAgentCoreAgentRuntime_lifecycleConfiguration PKG=bedrockagentcore

=== RUN   TestAccBedrockAgentCoreAgentRuntime_lifecycleConfiguration
=== PAUSE TestAccBedrockAgentCoreAgentRuntime_lifecycleConfiguration
=== RUN   TestAccBedrockAgentCoreAgentRuntime_lifecycleConfigurationMaxLifetimeOnly
=== PAUSE TestAccBedrockAgentCoreAgentRuntime_lifecycleConfigurationMaxLifetimeOnly
=== CONT  TestAccBedrockAgentCoreAgentRuntime_lifecycleConfiguration
=== CONT  TestAccBedrockAgentCoreAgentRuntime_lifecycleConfigurationMaxLifetimeOnly
--- PASS: TestAccBedrockAgentCoreAgentRuntime_lifecycleConfigurationMaxLifetimeOnly (32.96s)
--- PASS: TestAccBedrockAgentCoreAgentRuntime_lifecycleConfiguration (48.21s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/bedrockagentcore   55.494s

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