Moby added an exec_die container event a little over a year ago in f97256cbf1 via PR35744 (cherry-picked to docker-ce 18.03 via 27f91f80b9). The event reports a docker exec exit code, including HEALTHCHECK executions, and denotes that the executed command has completed. Portainer currently shows this as an Unsupported Event.

Is your feature request related to a problem? Please describe.
There's no immediate problem at issue. It is merely unclear when 1/3 events are displayed as Unsupported Event, and it's unclear if the docker exec instance encountered an error.

Describe the solution you'd like
Add support to Portainer for displaying the container exec_die event, preferably displaying the exit code, or a Success/Failure message, or similar.

Describe alternatives you've considered
Reducing the container's HEALTHCHECK interval to see fewer Unsupported Event entries.

Additional context
Portainer 1.20.1 shows the following event log:

In plain-text:

While docker events --since 30s shows:

2019-02-15T17:12:13.936857056Z container exec_create: /bin/sh -c /usr/local/bin/docker-healthcheck.sh || exit 1 f95b731a43db47cc2021079cc73f764c4884877508faf9e05aea6f3ca776ef82 (com.docker.compose.config-hash=3381614071d2645883f98a706a0ee30e10813b68341226db4f81ba57f2092735, com.docker.compose.container-number=1, com.docker.compose.oneoff=False, com.docker.compose.project=unifi, com.docker.compose.service=controller, com.docker.compose.version=1.23.2, execID=9551142e710462ba5abb658b0e8ec1aba7493b8e5b951aece21dc918158ef70b, image=unifi_controller, maintainer=Jacob Alberty <jacob.alberty@foundigital.com>, name=unifi_controller_1)
2019-02-15T17:12:13.936904975Z container exec_start: /bin/sh -c /usr/local/bin/docker-healthcheck.sh || exit 1 f95b731a43db47cc2021079cc73f764c4884877508faf9e05aea6f3ca776ef82 (com.docker.compose.config-hash=3381614071d2645883f98a706a0ee30e10813b68341226db4f81ba57f2092735, com.docker.compose.container-number=1, com.docker.compose.oneoff=False, com.docker.compose.project=unifi, com.docker.compose.service=controller, com.docker.compose.version=1.23.2, execID=9551142e710462ba5abb658b0e8ec1aba7493b8e5b951aece21dc918158ef70b, image=unifi_controller, maintainer=Jacob Alberty <jacob.alberty@foundigital.com>, name=unifi_controller_1)
2019-02-15T17:12:14.237065107Z container exec_die f95b731a43db47cc2021079cc73f764c4884877508faf9e05aea6f3ca776ef82 (com.docker.compose.config-hash=3381614071d2645883f98a706a0ee30e10813b68341226db4f81ba57f2092735, com.docker.compose.container-number=1, com.docker.compose.oneoff=False, com.docker.compose.project=unifi, com.docker.compose.service=controller, com.docker.compose.version=1.23.2, execID=9551142e710462ba5abb658b0e8ec1aba7493b8e5b951aece21dc918158ef70b, exitCode=0, image=unifi_controller, maintainer=Jacob Alberty <jacob.alberty@foundigital.com>, name=unifi_controller_1)