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Upgrading from 12.4 to 13 gives you 1.4 months worth of fixes (178 of them)

Configuration changes:

Removed config parameters:

Config parameter: Default value:
wal_keep_segments 0

Added config parameters:

Config parameter: Default value:
autovacuum_vacuum_insert_scale_factor 0.2
autovacuum_vacuum_insert_threshold 1000
backtrace_functions
enable_incremental_sort on
hash_mem_multiplier 1
ignore_invalid_pages off
log_min_duration_sample -1
log_parameter_max_length -1
log_parameter_max_length_on_error 0
log_statement_sample_rate 1
logical_decoding_work_mem 65536
maintenance_io_concurrency 10
max_slot_wal_keep_size -1
wal_keep_size 0
wal_receiver_create_temp_slot off
wal_skip_threshold 2048

Config parameters with changed default value:

Config parameter: Default value in Pg 12.4: Default value in Pg 13:
ssl_min_protocol_version TLSv1 TLSv1.2

List of changes: