--help --verboseよりも先に--plugin-load処理するんですね…

gistfile1.txt

$ docker run --entrypoint="/usr/sbin/mysqld" mysql/mysql-server:8.0 --plugin-load=group_replication.so --help --verbose  | grep group
The following groups are read: mysqld server mysqld-8.0
--defaults-group-suffix=#
                        Also read groups with concat(group, suffix)
  --binlog-group-commit-sync-delay=#
                      binary log group commit sync queue to fill before
  --binlog-group-commit-sync-no-delay-count=#
                      --binlog-group-commit-sync-delay), the commit procedure
                      The maximum time that the binary log group commit will
                      bytes. Rows will be grouped into events smaller than this
  --group-concat-max-len=#
  --group-replication[=name]
                      Enable or disable group_replication plugin. Possible
  --group-replication-allow-local-lower-version-join
                      Allow this server to join the group even if it has a
                      lower plugin version than the group
  --group-replication-auto-increment-increment[=#]
                      The group replication auto_increment_increment determines
  --group-replication-autorejoin-tries[=#]
  --group-replication-bootstrap-group
                      Specify if this member will bootstrap the group.
  --group-replication-clone-threshold[=#]
  --group-replication-communication-debug-options[=name]
  --group-replication-communication-max-message-size[=#]
  --group-replication-components-stop-timeout[=#]
  --group-replication-compression-threshold[=#]
  --group-replication-consistency[=name]
  --group-replication-enforce-update-everywhere-checks
  --group-replication-exit-state-action[=name]
                      The action that is taken when the server leaves the group
  --group-replication-flow-control-applier-threshold[=#]
  --group-replication-flow-control-certifier-threshold[=#]
  --group-replication-flow-control-hold-percent[=#]
  --group-replication-flow-control-max-quota[=#]
  --group-replication-flow-control-member-quota-percent[=#]
  --group-replication-flow-control-min-quota[=#]
  --group-replication-flow-control-min-recovery-quota[=#]
  --group-replication-flow-control-mode[=name]
  --group-replication-flow-control-period[=#]
  --group-replication-flow-control-release-percent[=#]
  --group-replication-force-members[=name]
                      new group membership, on which the excluded members will
  --group-replication-group-name[=name]
                      The group name
  --group-replication-group-seeds[=name]
                      The list of group seeds, comma separated. E.g.,
  --group-replication-gtid-assignment-block-size[=#]
  --group-replication-ip-whitelist[=name]
  --group-replication-local-address[=name]
  --group-replication-member-expel-timeout[=#]
                      group.
  --group-replication-member-weight[=#]
                      Member weight will determine the member role in the group
  --group-replication-message-cache-size[=#]
  --group-replication-poll-spin-loops[=#]
  --group-replication-recovery-complete-at[=name]
  --group-replication-recovery-compression-algorithms[=name]
  --group-replication-recovery-get-public-key
  --group-replication-recovery-public-key-path[=name]
  --group-replication-recovery-reconnect-interval[=#]
                      donor was found in the group
  --group-replication-recovery-retry-count[=#]
  --group-replication-recovery-ssl-ca[=name]
  --group-replication-recovery-ssl-capath[=name]
  --group-replication-recovery-ssl-cert[=name]
  --group-replication-recovery-ssl-cipher[=name]
  --group-replication-recovery-ssl-crl[=name]
  --group-replication-recovery-ssl-crlpath[=name]
  --group-replication-recovery-ssl-key[=name]
  --group-replication-recovery-ssl-verify-server-cert
  --group-replication-recovery-tls-ciphersuites[=name]
  --group-replication-recovery-tls-version[=name]
  --group-replication-recovery-use-ssl
  --group-replication-recovery-zstd-compression-level[=#]
  --group-replication-single-primary-mode
                      Instructs the group to automatically pick a single server
                      (Defaults to on; use --skip-group-replication-single-primary-mode to disable.)
  --group-replication-ssl-mode[=name]
  --group-replication-start-on-boot
                      (Defaults to on; use --skip-group-replication-start-on-boot to disable.)
  --group-replication-transaction-size-limit[=#]
  --group-replication-unreachable-majority-timeout[=#]
  --innodb-log-files-in-group=#
  --innodb-log-group-home-dir=name
  --slave-checkpoint-group=#
binlog-group-commit-sync-delay                               0
binlog-group-commit-sync-no-delay-count                      0
group-concat-max-len                                         1024
group-replication                                            ON
group-replication-allow-local-lower-version-join             FALSE
group-replication-auto-increment-increment                   7
group-replication-autorejoin-tries                           0
group-replication-bootstrap-group                            FALSE
group-replication-clone-threshold                            9223372036854775807
group-replication-communication-debug-options                GCS_DEBUG_NONE
group-replication-communication-max-message-size             10485760
group-replication-components-stop-timeout                    31536000
group-replication-compression-threshold                      1000000
group-replication-consistency                                EVENTUAL
group-replication-enforce-update-everywhere-checks           FALSE
group-replication-exit-state-action                          READ_ONLY
group-replication-flow-control-applier-threshold             25000
group-replication-flow-control-certifier-threshold           25000
group-replication-flow-control-hold-percent                  10
group-replication-flow-control-max-quota                     0
group-replication-flow-control-member-quota-percent          0
group-replication-flow-control-min-quota                     0
group-replication-flow-control-min-recovery-quota            0
group-replication-flow-control-mode                          QUOTA
group-replication-flow-control-period                        1
group-replication-flow-control-release-percent               50
group-replication-force-members
group-replication-group-name                                 (No default value)
group-replication-group-seeds
group-replication-gtid-assignment-block-size                 1000000
group-replication-ip-whitelist                               AUTOMATIC
group-replication-local-address
group-replication-member-expel-timeout                       0
group-replication-member-weight                              50
group-replication-message-cache-size                         1073741824
group-replication-poll-spin-loops                            0
group-replication-recovery-complete-at                       TRANSACTIONS_APPLIED
group-replication-recovery-compression-algorithms            uncompressed
group-replication-recovery-get-public-key                    FALSE
group-replication-recovery-public-key-path
group-replication-recovery-reconnect-interval                60
group-replication-recovery-retry-count                       10
group-replication-recovery-ssl-ca
group-replication-recovery-ssl-capath
group-replication-recovery-ssl-cert
group-replication-recovery-ssl-cipher
group-replication-recovery-ssl-crl
group-replication-recovery-ssl-crlpath
group-replication-recovery-ssl-key
group-replication-recovery-ssl-verify-server-cert            FALSE
group-replication-recovery-tls-ciphersuites                  (No default value)
group-replication-recovery-tls-version                       TLSv1,TLSv1.1,TLSv1.2,TLSv1.3
group-replication-recovery-use-ssl                           FALSE
group-replication-recovery-zstd-compression-level            3
group-replication-single-primary-mode                        TRUE
group-replication-ssl-mode                                   DISABLED
group-replication-start-on-boot                              TRUE
group-replication-transaction-size-limit                     150000000
group-replication-unreachable-majority-timeout               0
innodb-log-files-in-group                                    2
innodb-log-group-home-dir                                    (No default value)
slave-checkpoint-group                                       512