You can now use the official release of Mackerel's log feature
You can now search and share logs by service in the officially supported Mackerel log feature.
You can now read an explanation of observability and how it differs from monitoring
MackerelNotice
You can now read a guide explaining observability concepts, how it differs from monitoring, and adoption tips.
Screenshots
This summary is independently created by Release Radar and is not an official announcement from the vendor. Please read the official page for accurate details.
More updates
You can now preview target hosts on the downtime configuration screen
You can now verify downtime target hosts in advance and refine log searches, while dashboard auto-refresh conditions changed.
PHP vulnerabilities CVE-2026-109618 and CVE-2026-109619 do not affect Mackerel
The Mackerel service infrastructure and official mackerel-agent do not use PHP and are unaffected by the disclosed PHP vulnerabilities.
