Refresh rate is honoured exactly everywhere: no list floor, sampler up to 10 s, server caches reduced to coalescing only

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

internal/metrics/metrics.go

@@ -29,7 +29,7 @@ import (
 const (
 	DefaultInterval = 2 * time.Second
 	MinInterval     = 100 * time.Millisecond
-	MaxInterval     = 2 * time.Second
+	MaxInterval     = 10 * time.Second
 	History         = 300              // samples kept; the window is History × interval (30 s at 100 ms, 10 min at 2 s)
 	fsEvery         = 30 * time.Second // filesystem usage changes slowly and statfs on network mounts isn't free
 	upsEvery        = 10 * time.Second // UPS daemons are an exec each; don't hammer them at fast intervals
@@ -982,7 +982,7 @@ func (c *Collector) Processes() ProcTable {
 		c.prevProc = map[int]procTimes{}
 		c.procInfo = map[int]procStatic{}
 	}
-	if now.Sub(c.procAt) < 500*time.Millisecond && c.lastTable != nil { // coalesce bursts of clients
+	if now.Sub(c.procAt) < 100*time.Millisecond && c.lastTable != nil { // coalesce simultaneous clients only
 		return *c.lastTable
 	}
 	ents, err := os.ReadDir("/proc")