Server statistics, multi-view record commands, and rc.3 fixes

Added:
- Server statistics: named's memory and CPU (from /proc), cache size,
  sockets and client counts against their limits (statistics channel,
  rndc status), host memory and load, and free disk space. Memory and
  CPU are kept over time as gauges (sum and sample count, averaged in
  timelines). Statistics page Server section, jarl stats server,
  GET /stats/server.
- jarl record add|set|delete|disable|enable --view a,b | all: the same
  change in each view, applied as one changeset.
- Blocking can be paused until resumed (jarl block pause indefinitely,
  "Until I resume", {"indefinitely": true}).

Changed:
- List options (allow-transfer, forwarders, ...) get their braces added
  when given without them.
- The dashboard lists named-checkconf's warnings about the running
  configuration; the CLI prints them after an apply.
- Stats page: tile and card rows fill their width, and the queries and
  failed answers charts share margins so their time axes line up.
- Dashboard: options have their own tile.
- 24-hour times in the web UI.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/stats/poll.go

@@ -15,19 +15,31 @@ import (
 type Snapshot struct {
 	BootTime string
 	Values   map[string]int64
+	// Gauges are named's current values (memory, cache size, sockets),
+	// not counters.
+	Gauges     map[string]int64
+	Version    string
+	ConfigTime string
 }
 
-// serverJSON is the part of /json/v1/server Jarl uses.
+// serverJSON is the part of /json/v1 Jarl uses.
 type serverJSON struct {
-	BootTime string           `json:"boot-time"`
-	Opcodes  map[string]int64 `json:"opcodes"`
-	RCodes   map[string]int64 `json:"rcodes"`
-	QTypes   map[string]int64 `json:"qtypes"`
-	NSStats  map[string]int64 `json:"nsstats"`
-	Views    map[string]struct {
+	BootTime   string           `json:"boot-time"`
+	ConfigTime string           `json:"config-time"`
+	Version    string           `json:"version"`
+	SockStats  map[string]int64 `json:"sockstats"`
+	Memory     struct {
+		InUse int64 `json:"InUse"`
+	} `json:"memory"`
+	Opcodes map[string]int64 `json:"opcodes"`
+	RCodes  map[string]int64 `json:"rcodes"`
+	QTypes  map[string]int64 `json:"qtypes"`
+	NSStats map[string]int64 `json:"nsstats"`
+	Views   map[string]struct {
 		Resolver struct {
 			Stats      map[string]int64 `json:"stats"`
 			CacheStats map[string]int64 `json:"cachestats"`
+			Cache      map[string]int64 `json:"cache"` // RRsets in the cache by type
 		} `json:"resolver"`
 	} `json:"views"`
 }
@@ -77,7 +89,21 @@ func Flatten(body []byte) (*Snapshot, error) {
 			v[name] = n
 		}
 	}
+	g := map[string]int64{"named:mem": j.Memory.InUse,
+		"named:recursion-highwater": j.NSStats["RecursHighwater"], "named:tcp-highwater": j.NSStats["TCPConnHighWater"]}
+	for k, n := range j.SockStats {
+		switch {
+		case strings.HasPrefix(k, "UDP") && strings.HasSuffix(k, "Active"):
+			g["sockets:udp"] += n
+		case strings.HasPrefix(k, "TCP") && strings.HasSuffix(k, "Active"):
+			g["sockets:tcp"] += n
+		}
+	}
 	for _, view := range j.Views {
+		g["cache:mem"] += view.Resolver.CacheStats["TreeMemInUse"] + view.Resolver.CacheStats["HeapMemInUse"]
+		for _, n := range view.Resolver.Cache {
+			g["cache:rrsets"] += n
+		}
 		for k, name := range rttKeys {
 			v[name] += view.Resolver.Stats[k]
 		}
@@ -92,7 +118,7 @@ func Flatten(body []byte) (*Snapshot, error) {
 			delete(v, k)
 		}
 	}
-	return &Snapshot{BootTime: j.BootTime, Values: v}, nil
+	return &Snapshot{BootTime: j.BootTime, Values: v, Gauges: g, Version: j.Version, ConfigTime: j.ConfigTime}, nil
 }
 
 // Delta returns the change from prev to cur. When named restarted (its
@@ -120,13 +146,13 @@ func Delta(prev, cur *Snapshot) map[string]int64 {
 
 // Poller reads named's statistics channel.
 type Poller struct {
-	URL    string // e.g. http://127.0.0.1:8058/json/v1/server
+	URL    string // e.g. http://127.0.0.1:8058/json/v1 (server, memory and sockets)
 	Client *http.Client
 }
 
 // NewPoller returns a poller for a statistics channel address.
 func NewPoller(addr string) *Poller {
-	return &Poller{URL: "http://" + addr + "/json/v1/server", Client: &http.Client{Timeout: 10 * time.Second}}
+	return &Poller{URL: "http://" + addr + "/json/v1", Client: &http.Client{Timeout: 10 * time.Second}}
 }
 
 // Poll fetches a snapshot.