Add EventBuilder static class to EventTypes.cs with helpers for constructing
fully-populated ConnectEventMsg, DisconnectEventMsg, AccountNumConns, and
ServerStatsMsg. Also add RemoteServerShutdownEvent, RemoteServerUpdateEvent,
LeafNodeConnectEvent, and LeafNodeDisconnectEvent advisory types.
Add FullEventPayloadTests.cs (10 tests) covering all builders, GenerateEventId
uniqueness, GetTimestamp ISO 8601 format, DataStats zero defaults, and
ConnectEventMsg JSON roundtrip.
Add ConnzSortOption enum (ConnectionId, Start, BytesTo, BytesFrom,
MsgsTo, MsgsFrom, Subscriptions, Pending, Uptime, Idle, LastActivity)
and ConnzSorter static class with Parse(string?) and Sort(IEnumerable<ConnInfo>,
ConnzSortOption, bool) methods.
Add SortBy and SortDescending properties to ConnzFilterOptions and wire
them through ConnzFilterOptions.Parse (?sort= and ?desc= query params).
Add 10 unit tests in ConnzSortTests covering Parse defaults, known values,
unknown string fallback, and sort ordering for key fields.
Go reference: server/monitor_sort_opts.go, server/monitor.go Connz().
Replace ConcurrentQueue<ClosedClient> with ClosedConnectionRingBuffer — a
fixed-size ring buffer that overwrites oldest entries when full, eliminating
the manual dequeue-to-cap loop. Adds TotalClosed lifetime counter, GetRecent(),
and Clear(). Wires the ring buffer into NatsServer including capacity resize
on config reload. Adds 10 unit tests covering capacity, ordering, wrapping,
TotalClosed tracking, and Clear behavior.
Add ConnzConnectionInfo, ConnzFilterResult, ConnzFilterOptions, and
ConnzFilter static class to Connz.cs, providing a pure unit-testable
layer for account-scoped filtering and pagination that mirrors the Go
server's /connz ?acc= query-parameter behaviour. Ten new tests in
ConnzAccountFilterTests.cs cover FilterByAccount (match, no-match,
case-insensitive), ConnzFilterOptions.Parse (acc param, defaults,
offset/limit), and ApplyFilters (account filter, offset, limit,
no-filter pass-through).
