Add support for forecast options in AlertPolicy

[jedouard1994]

Resolves hashicorp/terraform-provider-google/issues/13569.

Adds support for forecast options in AlertPolicy.

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• Ensured that all new fields I added that can be set by a user appear in at least one example (for generated resources) or third_party test (for handwritten resources or update tests).
• Generated Terraform providers, and ran make test and make lint in the generated providers to ensure it passes unit and linter tests.
• Ran relevant acceptance tests using my own Google Cloud project and credentials (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• Read the Release Notes Guide before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

monitoring: added `forecast_options` field to `google_monitoring_alert_policy` resource

[modular-magician]

Oops! It looks like you're using an unknown release-note type in your changelog entries:

• REPLACEME

Please only use the types listed in https://github.com/GoogleCloudPlatform/magic-modules/blob/master/.ci/RELEASE_NOTES_GUIDE.md.

[modular-magician]

Hello! I am a robot who works on Magic Modules PRs.

I've detected that you're a community contributor. @shuyama1, a repository maintainer, has been assigned to assist you and help review your changes.

❓ First time contributing? Click here for more details

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Your assigned reviewer will help review your code by:

• Ensuring it's backwards compatible, covers common error cases, etc.
• Summarizing the change into a user-facing changelog note.
• Passes tests, either our "VCR" suite, a set of presubmit tests, or with manual test runs.

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

Terraform GA: Diff ( 3 files changed, 241 insertions(+))
Terraform Beta: Diff ( 3 files changed, 241 insertions(+))
TF Conversion: Diff ( 3 files changed, 33 insertions(+), 3 deletions(-))
TF OiCS: Diff ( 4 files changed, 124 insertions(+))

[modular-magician]

Tests analytics

Total tests: 2730
Passed tests 2444
Skipped tests: 278
Affected tests: 8

Action taken

Found 8 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

TestAccMonitoringAlertPolicy_monitoringAlertPolicyForecastOptionsExample|TestAccComputeFirewallPolicyRule_multipleRules|TestAccApigeeKeystoresAliasesKeyCertFile_apigeeKeystoresAliasesKeyCertFileTestExample|TestAccApigeeKeystoresAliasesPkcs12_ApigeeKeystoresAliasesPkcs12Example|TestAccAlloydbBackup_missingLocation|TestAccAlloydbCluster_missingLocation|TestAccDataSourceGoogleFirebaseAndroidAppConfig|TestAccDataSourceAlloydbLocations_basic

Get to know how VCR tests work

[modular-magician]

Tests passed during RECORDING mode:
TestAccMonitoringAlertPolicy_monitoringAlertPolicyForecastOptionsExample[Debug log]
TestAccApigeeKeystoresAliasesKeyCertFile_apigeeKeystoresAliasesKeyCertFileTestExample[Debug log]
TestAccApigeeKeystoresAliasesPkcs12_ApigeeKeystoresAliasesPkcs12Example[Debug log]
TestAccAlloydbBackup_missingLocation[Debug log]
TestAccAlloydbCluster_missingLocation[Debug log]
TestAccDataSourceGoogleFirebaseAndroidAppConfig[Debug log]
TestAccDataSourceAlloydbLocations_basic[Debug log]

Tests failed during RECORDING mode:
TestAccComputeFirewallPolicyRule_multipleRules[Error message] [Debug log]

Please fix these to complete your PR
View the build log or the debug log for each test

[shuyama1]

Thanks for making the change! I've added the changelog and please let me know if that makes sense. You can follow the Release Note Guide to add changelogs for any future contribution.

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

Terraform GA: Diff ( 3 files changed, 181 insertions(+), 5 deletions(-))
Terraform Beta: Diff ( 3 files changed, 181 insertions(+), 5 deletions(-))
TF Conversion: Diff ( 3 files changed, 33 insertions(+), 3 deletions(-))

Missing test report

Your PR includes resource fields which are not covered by any test.

Resource: google_monitoring_alert_policy (1 total tests)
Untested fields: conditions.condition_threshold.forecast_options.forecast_horizon

Please add acceptance tests which include these fields.

[modular-magician]

Tests analytics

Total tests: 2729
Passed tests 2443
Skipped tests: 278
Affected tests: 8

Action taken

Found 8 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

TestAccMonitoringAlertPolicy|TestAccComputeFirewallPolicyRule_multipleRules|TestAccAlloydbBackup_missingLocation|TestAccAlloydbCluster_missingLocation|TestAccApigeeKeystoresAliasesPkcs12_ApigeeKeystoresAliasesPkcs12Example|TestAccDataSourceGoogleFirebaseAndroidAppConfig|TestAccApigeeKeystoresAliasesKeyCertFile_apigeeKeystoresAliasesKeyCertFileTestExample|TestAccDataSourceAlloydbLocations_basic

Get to know how VCR tests work

[modular-magician]

Tests passed during RECORDING mode:
TestAccMonitoringAlertPolicy[Debug log]
TestAccAlloydbBackup_missingLocation[Debug log]
TestAccAlloydbCluster_missingLocation[Debug log]
TestAccApigeeKeystoresAliasesPkcs12_ApigeeKeystoresAliasesPkcs12Example[Debug log]
TestAccDataSourceGoogleFirebaseAndroidAppConfig[Debug log]
TestAccApigeeKeystoresAliasesKeyCertFile_apigeeKeystoresAliasesKeyCertFileTestExample[Debug log]
TestAccDataSourceAlloydbLocations_basic[Debug log]

Tests failed during RECORDING mode:
TestAccComputeFirewallPolicyRule_multipleRules[Error message] [Debug log]

Please fix these to complete your PR
View the build log or the debug log for each test

[jedouard1994]

Thanks for the review Shuya, I've made the changes requested

[shuyama1]

LGTM! Thank you!