"Output type is not supported" after upgrading to Graylog 4.3.2

[vasilen-co]

After upgrading docker image from Graylog 4.2.3 to 4.3.2 the Slack plugin 3.1.0 stopped to work and configuration is not available from Graylog UI.

Error from Graylog output:

com.google.common.util.concurrent.UncheckedExecutionException: java.lang.IllegalArgumentException: Output type is not supported: org.graylog2.plugins.slack.output.SlackMessageOutput
Caused by: java.lang.IllegalArgumentException: Output type is not supported: org.graylog2.plugins.slack.output.SlackMessageOutput

Docker setup:

FROM graylog/graylog:4.3.2

USER root

RUN apt-get update \
    && apt-get install -y wget

RUN wget -O /usr/share/graylog/plugin/graylog-plugin-slack-3.1.0 https://github.com/graylog-labs/graylog-plugin-slack/releases/download/3.1.0/graylog-plugin-slack-3.1.0.jar

COPY patterns/* /opt/

USER ${GRAYLOG_USER}