MailboxDropReason
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MailboxDropReason =
"drop-head"|"drop-new"
Defined in: src/internal/Mailbox.ts:49
Why a mailbox discarded a message — the reason label on
actor_mailbox_dropped_total.
Deliberately a closed set of two rather than a free-form string, even for a
mailbox of your own: reason is a metric label, and an open one is a
cardinality vector (#745). Pick whichever describes what you did — you
dropped the oldest queued message, or you dropped the arriving one.
Refusing a message is not a drop; that throws instead.
Lives here rather than in BoundedMailboxOptions.ts despite typing an
option field there: it is the vocabulary of DropReportingMailbox,
which every mailbox may implement, and BoundedMailbox is only the
built-in one that does. The layering runs base → subclass, so the shared
word belongs at the base.