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feat: add system request-reply monitoring services ($SYS.REQ.SERVER.*)

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Register VARZ, HEALTHZ, SUBSZ, STATSZ, and IDZ request-reply handlers
on $SYS.REQ.SERVER.{id}.* subjects and $SYS.REQ.SERVER.PING.* wildcard
subjects via InitEventTracking. Also excludes the $SYS system account
from the /subz monitoring endpoint by default since its subscriptions
are internal infrastructure.
This commit is contained in:
Joseph Doherty
2026-02-23 05:48:32 -05:00
parent 0b34f8cec4
commit 5bae9cc289
4 changed files with 309 additions and 3 deletions
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10
src/NATS.Server/Monitoring/SubszHandler.cs
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@@ -14,12 +14,16 @@ public sealed class SubszHandler(NatsServer server)
var opts = ParseQueryParams(ctx);
var now = DateTime.UtcNow;
// Collect subscriptions from all accounts (or filtered)
// Collect subscriptions from all accounts (or filtered).
// Exclude the $SYS system account unless explicitly requested — its internal
// subscriptions are infrastructure and not user-facing.
var allSubs = new List<Subscription>();
foreach (var account in server.GetAccounts())
{
if (!string.IsNullOrEmpty(opts.Account) && account.Name != opts.Account)
continue;
if (string.IsNullOrEmpty(opts.Account) && account.Name == "$SYS")
continue;
allSubs.AddRange(account.SubList.GetAllSubscriptions());
}
@@ -31,10 +35,10 @@ public sealed class SubszHandler(NatsServer server)
var total = allSubs.Count;
var numSubs = server.GetAccounts()
.Where(a => string.IsNullOrEmpty(opts.Account) || a.Name == opts.Account)
.Where(a => (string.IsNullOrEmpty(opts.Account) && a.Name != "$SYS") || a.Name == opts.Account)
.Aggregate(0u, (sum, a) => sum + a.SubList.Count);
var numCache = server.GetAccounts()
.Where(a => string.IsNullOrEmpty(opts.Account) || a.Name == opts.Account)
.Where(a => (string.IsNullOrEmpty(opts.Account) && a.Name != "$SYS") || a.Name == opts.Account)
.Sum(a => a.SubList.CacheCount);
SubDetail[] details = [];