Backported changes from PR 3840 (#3900)

Author: rao-shwe

modules/rest-api/pages/rest-xdcr-adv-settings.adoc

@@ -94,13 +94,27 @@ If successful, the call returns an object similar to the following:
 
 ----
 {
-  "casDriftThresholdSecs": 100,
+  "cLogConnPoolGCIntervalMs": 60000,
+  "cLogConnPoolLimit": 30,
+  "cLogConnPoolReapIntervalMs": 120000,
+  "cLogErrorTimeWindowMs": 120000,
+  "cLogMaxErrorCount": 10,
+  "cLogNetworkRetryCount": 5,
+  "cLogNetworkRetryIntervalMs": 2000,
+  "cLogPoolGetTimeoutMs": 5000,
+  "cLogQueueCapacity": 6000,
+  "cLogReattemptDurationMs": 600000,
+  "cLogSetTimeoutMs": 5000,
+  "cLogWorkerCount": 20,
+  "casDriftThresholdSecs": 3900,
   "checkpointInterval": 600,
   "ckptSvcCacheEnabled": true,
   "collectionsOSOMode": true,
   "compressionType": "Auto",
+  "conflictLogging": {},
   "dcpEnablePurgeRollback": false,
   "desiredLatency": 50,
+  "disableHlvBasedShortCircuit": false,
   "docBatchSizeKb": 2048,
   "failureRestartInterval": 10,
   "filterBinary": false,
@@ -128,6 +142,7 @@ If successful, the call returns an object similar to the following:
   "retryOnRemoteAuthErrMaxWaitSec": 360,
   "skipReplSpecAutoGc": false,
   "sourceNozzlePerNode": 2,
+  "targetTopologyLogFrequency": 1800,
   "statsInterval": 1000,
   "targetNozzlePerNode": 2,
   "targetTopologyLogFrequency": 1800,
@@ -331,6 +346,60 @@ curl -X POST -u Administrator:password http://localhost:8091/<settings_URI> -d m
 
 For information about _XDCR with Sync Gateway mobile clusters in a bi-directional, active-active replication_, see xref:learn:clusters-and-availability/xdcr-active-active-sgw.adoc[XDCR Active-Active with Sync Gateway].
 
+===== Change Settings for XDCR Generic Services Log Levels
+
+The following example modifies the log levels for XDCR Generic Services, for a specific replication.
+Usually, you modify the log levels only when requested by Couchbase Support.
+
+----
+curl -X POST -u Administrator:password http://localhost:8091/settings/replications -d 'genericServicesLogLevel={"RemoteClusterService":"Debug","ReplicationSpecService":"Error","BucketTopologyService":"Debug","CheckpointService":"Error"}'
+----
+
+If successful, the call returns an object containing all current Generic Services related log level settings for the replication, including what's changed:
+
+----
+{
+...
+"genericServicesLogLevel": {
+    "AdminPort": "Info",
+    "AuditService": "Info",
+    "BackfillManager": "Info",
+    "BackfillReplicationService": "Info",
+    "BucketTopologyService": "Debug",
+    "CapiService": "Info",
+    "CheckpointService": "Error",
+    "CollectionsManifestService": "Info",
+    "Default": "Info",
+    "GenericSupervisor": "Info",
+    "GlobalSettingsService": "Info",
+    "HttpServer": "Info",
+    "InternalSettingsService": "Info",
+    "ManifestService": "Info",
+    "MessageUtils": "Info",
+    "MetaKVMetadataService": "Info",
+    "MigrationService": "Info",
+    "P2PManagerService": "Info",
+    "PipelineManager": "Info",
+    "RemoteClusterService": "Debug",
+    "ReplicationSettingService": "Info",
+    "ReplicationSpecService": "Error",
+    "ResourceManager": "Info",
+    "SecurityService": "Info",
+    "ThroughputThrottlerService": "Info",
+    "TopologyService": "Info",
+    "UtilsService": "Info",
+    "XDCRFactory": "Info"
+  },
+...
+}
+----
+
+To view the current log levels for XDCR Generic Services anytime, use the following command:
+
+----
+curl -s -X GET  -u Administrator:password http://localhost:8091/settings/replications  | jq
+----
+
 [#xdcr-advanced-settings-rest]
 == List of Advanced Settings
 
@@ -445,6 +514,20 @@ For supported expressions, see xref:xdcr-reference:xdcr-filtering-reference-intr
 
 This setting can only be established for and retrieved from an individual replication: it cannot be established or retrieved as part of global settings.
 
+| `genericServicesLogLevel`
+| JSON Object
+| This is the Generic Services related log level settings for the replication.
+
+The keys represent service names and the associated values represent log levels.
+
+In the example, the log level for `RemoteClusterService` is set to `Debug`, and for `ReplicationSpecService`, it's set to `Error`.
+
+By default, non-pipeline specific services use the `Info` log level.
+You can also set the log level to `Error`, `Debug`, or `Trace`.
+
+The `Default` key sets the log level for shared utilities like connection pools and data pools, which are used by multiple services.
+All these utilities use the same default logger, so changing the log level in `Default` affects all logger dependent utilities.
+
 | `goGC`
 | Integer (0 to 100) or String ("off")
 | Default: 100.