Boltdb shipper doc fixes (#3265)

* Remove incorrect value for boltdb_shipper.resync_interval in example doc which anyways has a default value of 5m

* Update incorrect default value for resync_interval mentioned in docs

* Add boltdb shipper configuration in config reference file

docs/sources/configuration/_index.md

@@ -1353,6 +1353,36 @@ filesystem:
   # CLI flag: -local.chunk-directory
   directory: <string>
 
+# Configures storing index in an Object Store(GCS/S3/Azure/Swift/Filesystem) in the form of boltdb files.
+# Required fields only required when boltdb-shipper is defined in config.  
+boltdb_shipper:
+  # Directory where ingesters would write boltdb files which would then be
+  # uploaded by shipper to configured storage
+  # CLI flag: -boltdb.shipper.active-index-directory
+  [active_index_directory: <string> | default = ""]
+
+  # Shared store for keeping boltdb files. Supported types: gcs, s3, azure,
+  # filesystem
+  # CLI flag: -boltdb.shipper.shared-store
+  [shared_store: <string> | default = ""]
+
+  # Cache location for restoring boltDB files for queries
+  # CLI flag: -boltdb.shipper.cache-location
+  [cache_location: <string> | default = ""]
+
+  # TTL for boltDB files restored in cache for queries
+  # CLI flag: -boltdb.shipper.cache-ttl
+  [cache_ttl: <duration> | default = 24h]
+
+  # Resync downloaded files with the storage
+  # CLI flag: -boltdb.shipper.resync-interval
+  [resync_interval: <duration> | default = 5m]
+
+  # Number of days of index to be kept downloaded for queries. Works only with
+  # tables created with 24h period.
+  # CLI flag: -boltdb.shipper.query-ready-num-days
+  [query_ready_num_days: <int> | default = 0]
+
 # Cache validity for active index entries. Should be no higher than
 # the chunk_idle_period in the ingester settings.
 # CLI flag: -store.index-cache-validity

docs/sources/configuration/examples.md

@@ -233,7 +233,6 @@ storage_config:
  boltdb_shipper:
    active_index_directory: /loki/index
    cache_location: /loki/index_cache
-   resync_interval: 5s
    shared_store: s3
 
  aws:

docs/sources/operations/storage/boltdb-shipper.md

@@ -86,7 +86,7 @@ For all the queries which require chunks to be read from the store, Queriers als
 
 Queriers lazily loads BoltDB files from shared object store to configured `cache_location`.
 When a querier receives a read request, the query range from the request is resolved to period numbers and all the files for those period numbers are downloaded to `cache_location`, if not already.
-Once we have downloaded files for a period we keep looking for updates in shared object store and download them every 15 Minutes by default.
+Once we have downloaded files for a period we keep looking for updates in shared object store and download them every 5 Minutes by default.
 Frequency for checking updates can be configured with `resync_interval` config.
 
 To avoid keeping downloaded index files forever there is a ttl for them which defaults to 24 hours, which means if index files for a period are not used for 24 hours they would be removed from cache location.