Rechecked splunkd.log and it all looks good and can see it is updating buckets
08-20-2019 14:24:02.400 +0100 INFO IndexWriter - idx=_introspection, Initializing, params='[300,period=60,frozenTimePeriodInSecs=1209600,coldToFrozenScript=,coldToFrozenDir=,warmToColdScript=,maxHotBucketSize=1073741824,optimizeEvery=5,syncMeta=true,maxTotalDataSizeMB=500000,maxMemoryAllocationPerHotSliceMB=5,addressCompressBits=5,isReadOnly=false,maxMergizzles=6,maxHotSpanSecs=7776000,maxMetadataEntries=1000000,maxHotIdleSecs=0,maxHotBuckets=3,quarantinePastSecs=77760000,quarantineFutureSecs=2592000,maxSliceSize=131072,serviceMetaPeriod=25,partialServiceMetaPeriod=0,throttleCheckPeriod=15,homePath_maxDataSizeBytes=0,coldPath_maxDataSizeBytes=0,compressionType=gzip,lz4BlockSize=65536,compressionLevel=-1,fsyncInterval=18446744073709551615,maxBloomBackfillBucketAge_secs=2592000,enableOnlineBucketRepair=true,enableDataIntegrityControl=false,maxUnreplicatedMsecWithAcks=60000,maxUnreplacatedMsecNoAcks=300000,alwaysBloomBackfill=false,minStreamGroupQueueSize=2000,streamingTargetTsidxSyncPeriodMsec=5000,repFactor=0,hotBucketTimeRefreshInterval=10,enableTsidxReduction=0,tsidxReductionCheckPeriodInSec=600,timePeriodInSecBeforeTsidxReduction=604800]' isSlave=false
08-20-2019 14:24:02.401 +0100 INFO IndexWriter - openDatabases complete currentId=499 idx=_introspection
08-20-2019 14:24:03.311 +0100 INFO IndexWriter - idx=_introspection Creating hot bucket=hot_v1_499, given event timestamped=1566307442
08-20-2019 14:24:03.311 +0100 INFO DatabaseDirectoryManager - idx=_introspection Writing a bucket manifest in hotWarmPath='/opt/splunk/var/lib/splunk/_introspection/db', pendingBucketUpdates=0 . Reason='Adding bucket, bid=_introspection~499~6ED11580-5140-4ED9-BA6C-06B0C3FC8D1A'
08-20-2019 14:24:03.415 +0100 INFO DatabaseDirectoryManager - idx=_introspection Writing a bucket manifest in hotWarmPath='/opt/splunk/var/lib/splunk/_introspection/db', pendingBucketUpdates=0 . Reason='Buckets were rebuilt or tsidx-minified (bucket_count=1).'
08-20-2019 14:24:04.042 +0100 INFO IndexerIf - Asked to add or update bucket manifest values, bid=_introspection~498~6ED11580-5140-4ED9-BA6C-06B0C3FC8D1A
08-20-2019 14:24:04.347 +0100 INFO DatabaseDirectoryManager - idx=_introspection Writing a bucket manifest in hotWarmPath='/opt/splunk/var/lib/splunk/_introspection/db', pendingBucketUpdates=1 . Reason='Updating manifest: bucketUpdates=1'
No visible errors being called out.
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