message: Removing fluentd prometheus plugin version constraint.
diff: FROM fluent/fluentd:v0.12
  +# Note; we are _NOT_ running fluentd v0.12
  +# One of the gem commands below is upgrading fluentd to the newest version
  USER root
  @@ -9,7 +11,7 @@ RUN apk add --no-cache tini \
  fluent-plugin-elasticsearch \
  fluent-plugin-secure-forward \
  fluent-plugin-record-modifier \
  - && gem install fluent-plugin-prometheus --version='~>0.4.0' \
  + fluent-plugin-prometheus \
  && gem sources --clear-all \
  && apk del .build-deps \
  && rm -rf /var/cache/apk/* \
  