app/views/mailer/webauthn_credential_removed.text.erb
<%= t("mailer.webauthn_credential_removed.subtitle", handle: @user.handle) %>
A new security device was removed from your account on RubyGems.org.
Name: <%= @nickname %>
Deleted at: <%= @deleted_at.to_formatted_s(:rfc822) %>
If this device deletion was expected, you do not need to take further action.
Only if this is unexpected behavior, please take immediate steps to secure your account and gems:
<%= render "compromised_instructions" %>