[bugfix] Align default values in the configuration file with the code (#1971)

* Set default value of SMTPFrom to empty string

This parameter should contain proper e-mail address (to be provided by user during configuration).

* Update default values in example/config.yaml

Default values and related comments in example/config.yaml are aligned
with values defined in internal/config/defaults.go.
Small improvements to foramting of config.yaml file.

* Add default value for AdvancedThrottlingRetryAfter to internal/config/defaults.go

AdvancedThrottlingRetryAfter was introduced in 70739d3 (superseriousbusiness/gotosocial#1466).

* Update config.yaml snippets in documentation

example/config.yaml

@@ -231,8 +231,8 @@ db-sqlite-cache-size: "8MiB"
 # If set to empty string or zero, the sqlite default will be used.
 # See: https://www.sqlite.org/pragma.html#pragma_busy_timeout
 # Examples: ["0s", "1s", "30s", "1m", "5m"]
-# Default: "5s"
-db-sqlite-busy-timeout: "5m"
+# Default: "30m"
+db-sqlite-busy-timeout: "30m"
 
 cache:
   # Cache configuration options:
@@ -246,7 +246,7 @@ cache:
   #### VISIBILITY CACHES ######
   #############################
   #
-  # Configure Status and account 
+  # Configure Status and account
   # visibility cache.
 
   visibility-max-size: 2000
@@ -265,7 +265,7 @@ cache:
     account-ttl: "30m"
     account-sweep-freq: "1m"
 
-    block-max-size: 100
+    block-max-size: 1000
     block-ttl: "30m"
     block-sweep-freq: "1m"
 
@@ -289,6 +289,10 @@ cache:
     follow-request-ttl: "30m"
     follow-request-sweep-freq: "1m"
 
+    instance-max-size: 2000
+    instance-ttl: "30m"
+    instance-sweep-freq: "1m"
+
     list-max-size: 2000
     list-ttl: "30m"
     list-sweep-freq: "1m"
@@ -331,7 +335,7 @@ cache:
 
     webfinger-max-size: 250
     webfinger-ttl: "24h"
-    webfinger-sweep-freq: "1m"
+    webfinger-sweep-freq: "15m"
 
 ######################
 ##### WEB CONFIG #####
@@ -490,7 +494,7 @@ media-emoji-local-max-size: 51200
 # This strikes a good balance between decent interoperability with instances that have
 # higher emoji size limits, and not taking up too much space in storage.
 # Examples: [51200, 102400]
-# Default: 51200
+# Default: 102400
 media-emoji-remote-max-size: 102400
 
 ##########################
@@ -515,7 +519,7 @@ storage-local-base-path: "/gotosocial/storage"
 # String. API endpoint of the S3 compatible service.
 # Only required when running with the s3 storage backend.
 # Examples: ["minio:9000", "s3.nl-ams.scw.cloud", "s3.us-west-002.backblazeb2.com"]
-# GoToSocial uses "DNS-style" when accessing buckets. 
+# GoToSocial uses "DNS-style" when accessing buckets.
 # If you are using Scaleways object storage, please remove the "bucket name" from the endpoint address
 # Default: ""
 storage-s3-endpoint: ""
@@ -524,6 +528,7 @@ storage-s3-endpoint: ""
 #
 # Default: false
 storage-s3-proxy: false
+
 # Bool. Use SSL for S3 connections.
 #
 # Only set this to 'false' when testing locally.
@@ -537,12 +542,14 @@ storage-s3-use-ssl: true
 # Examples: ["AKIAJSIE27KKMHXI3BJQ","miniouser"]
 # Default: ""
 storage-s3-access-key: ""
+
 # String. Secret key part of the S3 credentials.
 # Consider setting this value using environment variables to avoid leaking it via the config file
 # Only required when running with the s3 storage backend.
 # Examples: ["5bEYu26084qjSFyclM/f2pz4gviSfoOg+mFwBH39","miniopassword"]
 # Default: ""
 storage-s3-secret-key: ""
+
 # String. Name of the storage bucket.
 #
 # If you have already encoded your bucket name in the storage-s3-endpoint, this
@@ -632,7 +639,7 @@ letsencrypt-email-address: ""
 ##### MANUAL TLS CONFIG  #####
 ##############################
 
-# String. Path to a PEM-encoded file on disk that includes the certificate chain 
+# String. Path to a PEM-encoded file on disk that includes the certificate chain
 # and the public key
 # Examples: ["/gotosocial/storage/certs/chain.pem"]
 # Default: ""
@@ -775,7 +782,7 @@ syslog-enabled: false
 
 # String. Protocol to use when directing logs to syslog. Leave empty to connect to local syslog.
 # Options: ["udp", "tcp", ""]
-# Default: "tcp"
+# Default: "udp"
 syslog-protocol: "udp"
 
 # String. Address:port to send syslog logs to. Leave empty to connect to local syslog.
@@ -939,7 +946,7 @@ advanced-throttling-multiplier: 8
 # Minimum resolution is 1 second.
 #
 # Examples: [30s, 10s, 5s, 1m]
-# Default: 30s
+# Default: "30s"
 advanced-throttling-retry-after: "30s"
 
 # Int. CPU multiplier for the amount of goroutines to spawn in order to send messages via ActivityPub.