src/main/java/com/gitblit/tickets/viewTicket.html

<script type="application/ld+json">
{
  "@context": "http://schema.org",
  "@type": "EmailMessage",
  "description": "View this Ticket in Gitblit",
  "action": {
    "@type": "ViewAction",
    "url": "${url}",
    "name": "View Ticket"
  }
}
</script>