Hanzo Sentinel
Error tracking and performance monitoring
Sentinel takes the errors your applications throw, groups the identical ones into a single issue, and tells you which issues are new, which came back, and which are getting worse. It speaks the Sentry wire protocol, so the client libraries you already have report to it unchanged — a DSN pointing at your instance is the only line that differs. There is no Sentinel SDK to adopt, and none is planned. The protocol is the interface.
Enough context to fix it without asking
A stack trace tells you where. The rest of this tells you who, how often, since when, and what they were doing.
One issue, not ten thousand events
Identical exceptions collapse into a single issue with a count and a first-seen date. Minified frontend frames are resolved through your source maps, and the breadcrumbs leading up to the throw come with it, so you read what the person did rather than guessing.
Traces, and profiles under them
A request that crosses four services is one trace, and the span that took the time is visible in it. Profiles go a level down to the function. Session replay shows the same failure from the browser's side.
Did this release make it worse
Crash-free sessions per release, so a regression shows up in the first hour of a rollout rather than in a support queue on Monday. Cron monitors catch the opposite failure — the job that stopped running and threw nothing at all.
Which customers are hitting it
Events carry the identity and the environment they came from, so an issue can be read as a list of affected accounts. That turns triage from a guess about severity into a decision about who to call.
Where the alert goes
New issues, regressions and spikes route to Slack, PagerDuty, Opsgenie, Discord, Microsoft Teams, email, or a webhook of your own. It can also open the ticket — GitHub, GitLab, Jira and Bitbucket are wired both ways.
A fork, and it says so
Sentinel is a fork of Sentry, used under the Functional Source License with attribution kept current. Sentry is a trademark of Functional Software, Inc., and Sentinel is neither affiliated with nor endorsed by them. Naming what you forked is not the same as branding yourself with it.