update docs & help: two memberlist default changes

cmd/mimir/config-descriptor.json

@@ -9900,7 +9900,7 @@
           "required": false,
           "desc": "Timeout for leaving memberlist cluster.",
           "fieldValue": null,
-          "fieldDefaultValue": 5000000000,
+          "fieldDefaultValue": 20000000000,
           "fieldFlag": "memberlist.leave-timeout",
           "fieldType": "duration",
           "fieldCategory": "advanced"
@@ -9942,7 +9942,7 @@
           "required": false,
           "desc": "Timeout used when connecting to other nodes to send packet.",
           "fieldValue": null,
-          "fieldDefaultValue": 5000000000,
+          "fieldDefaultValue": 2000000000,
           "fieldFlag": "memberlist.packet-dial-timeout",
           "fieldType": "duration",
           "fieldCategory": "advanced"

cmd/mimir/help-all.txt.tmpl

@@ -1099,7 +1099,7 @@ Usage of ./cmd/mimir/mimir:
   -memberlist.join string
     	Other cluster members to join. Can be specified multiple times. It can be an IP, hostname or an entry specified in the DNS Service Discovery format.
   -memberlist.leave-timeout duration
-    	Timeout for leaving memberlist cluster. (default 5s)
+    	Timeout for leaving memberlist cluster. (default 20s)
   -memberlist.left-ingesters-timeout duration
     	How long to keep LEFT ingesters in the ring. (default 5m0s)
   -memberlist.max-join-backoff duration
@@ -1113,7 +1113,7 @@ Usage of ./cmd/mimir/mimir:
   -memberlist.nodename string
     	Name of the node in memberlist cluster. Defaults to hostname.
   -memberlist.packet-dial-timeout duration
-    	Timeout used when connecting to other nodes to send packet. (default 5s)
+    	Timeout used when connecting to other nodes to send packet. (default 2s)
   -memberlist.packet-write-timeout duration
     	Timeout for writing 'packet' data. (default 5s)
   -memberlist.pullpush-interval duration

docs/sources/operators-guide/configure/reference-configuration-parameters/index.md

@@ -2228,7 +2228,7 @@ The `memberlist` block configures the Gossip memberlist.
 
 # (advanced) Timeout for leaving memberlist cluster.
 # CLI flag: -memberlist.leave-timeout
-[leave_timeout: <duration> | default = 5s]
+[leave_timeout: <duration> | default = 20s]
 
 # (advanced) How much space to use for keeping received and sent messages in
 # memory for troubleshooting (two buffers). 0 to disable.
@@ -2246,7 +2246,7 @@ The `memberlist` block configures the Gossip memberlist.
 
 # (advanced) Timeout used when connecting to other nodes to send packet.
 # CLI flag: -memberlist.packet-dial-timeout
-[packet_dial_timeout: <duration> | default = 5s]
+[packet_dial_timeout: <duration> | default = 2s]
 
 # (advanced) Timeout for writing 'packet' data.
 # CLI flag: -memberlist.packet-write-timeout