feat(alert-manager): route alerts to Slack via newspack_log

[miguelpeixe]

All Submissions:

• Have you followed the Newspack Contributing guideline?
• Does your code follow the WordPress' coding standards and VIP Go coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Adds a forward_alert_to_log listener on newspack_alert in Alert_Manager. The listener emits do_action( 'newspack_log', $code, $message, [ 'log_level' => 3, ... ] ), which Newspack Manager's Logger already routes through Jetpack to the Newspack Slack alerts channel.

Existing precedent for log_level => 3 → Slack alert is in newspack-manager's class-data-report.php:352.

Closes NPPD-1443.

How to test the changes in this Pull Request:

1. Check out this branch on a site with newspack-manager active and connected to a hub (so newspack_log actually round-trips through Jetpack).

2. From wp shell (or a quick snippet), fire a synthetic alert:

   do_action( 'newspack_alert', [
       'type'      => 'sync_retry_exhausted',
       'severity'  => 'error',
       'message'   => 'Synthetic test from alert-log-forward PR',
       'context'   => [ 'integration_id' => 'mailchimp' ],
       'timestamp' => time(),
   ] );

3. Confirm a level 3 log is fired with the alert message

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

[Copilot]

Pull request overview

Adds alert forwarding from newspack_alert to newspack_log so Newspack Manager can route alert-level logs to Slack.

Changes:

• Registers Alert_Manager::forward_alert_to_log() on newspack_alert.
• Emits newspack_log entries with log_level => 3.
• Adds unit tests for forwarding and malformed alert payloads.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
includes/class-alert-manager.php	Adds the alert-to-log forwarding hook and implementation.
tests/unit-tests/alert-manager.php	Adds cleanup and tests for alert log forwarding behavior.

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[chickenn00dle]

LGTM — local checks (lint, PHPUnit for Alert_Manager: 18 tests / 72 assertions) and CI are all green. The newspack_log contract — ( $code, $message, $params ) with type ∈ error|debug and log_level ∈ 1..4 — matches Logger::log and the precedent at newspack-manager's class-data-report.php:352. Severity-to-level mapping aligns; dropping context from the forwarded params is correct (passing as data would JSON-encode reader identifiers into the log payload).

Approving — none of the inline comments are blockers, just refinements worth considering before merge.

[miguelpeixe]

Thanks, @chickenn00dle! I've addressed the suggestions.

[github-actions]

Hey @miguelpeixe, good job getting this PR merged! 🎉

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