Is it possible to remove the dyno, dynotype and appname tags?

[langsharpe]

Is it possible for the tags section of datadog.yaml to be empty? For example, we used to remove the tags in our prerun.sh like this:

sed -i -e 's/^  - dyno:.*$/# &/' "$DATADOG_CONF"
sed -i -e 's/^  - dynotype:.*$/# &/' "$DATADOG_CONF"
sed -i -e 's/^  - appname:.*$/# &/' "$DATADOG_CONF"

Since #182, this hasn't worked because the prerun script is run before the dyno tags are added to the config file.

I tried updating our prerun script to this:

export DD_TAGS="dyno dynotype appname"

However, this just added empty tags to the generated tag list.

tags:
  - dyno:run.6433
  - dynotype:run
  - buildpackversion:dev
  - appname:fgf-heroku-drain-datadog
  - dyno
  - dynotype
  - appname

The app we run is monitoring other apps. It sets these tags itself. The default tags get in the way.

Thanks!