issue 974: review 1: a verb's end, a provisioner client's word and a failed key read each ask or retry a look; the silent bucket ages; the acceptance test starts the rollout through the serving wiring

internal/broker/controller_buckets.go

@@ -97,6 +97,11 @@ const MergeWindowMarkerTTL = time.Minute
 // RolloutSilentMarkerTTL is how long the marker an expired silent key leaves is kept, for the same reason.
 const RolloutSilentMarkerTTL = time.Minute
 
+// RolloutSilentKeptFor is the age of the silent keys' bucket: every report deletes a key and the delete leaves a marker, which
+// with one value per key would stay for ever and fill the bucket. A key lives a quarter of an hour at most, so an hour
+// takes nothing live.
+const RolloutSilentKeptFor = time.Hour
+
 // AskedKeptFor is how long an ask is kept after it was made: a month, as the router keeps its own.
 const AskedKeptFor = 30 * 24 * time.Hour
 
@@ -251,6 +256,7 @@ func (j *JetStream) EnsureControllerBuckets() error {
 			"lives the time a machine may stay silent and is deleted by its report; one that expires names the " +
 			"machine silent; written by the controller alone",
 		History:        1,
+		TTL:            RolloutSilentKeptFor,
 		MaxValueSize:   4 << 10,
 		MaxBytes:       8 << 20,
 		Storage:        jetstream.FileStorage,