Is it there any possibility of define dynamic labels on containers? Like the "hostname"

[basili...@softonic.com]

Hi, 

I see that each time I create a service some labels are automatically assigned to the containers that run each service task. For example:

```

"Labels": {

                "com.docker.swarm.node.id": "0td8h541ayzmzh8mdlayvi9ks",

                "com.docker.swarm.service.id": "cr01rvd7ugu3a5r5gs3apypau",

                "com.docker.swarm.service.name": "deleteme2",

                "com.docker.swarm.task": "",

                "com.docker.swarm.task.id": "e3cif2jl3wdmfd56dpgkxebga",

                "com.docker.swarm.task.name": "deleteme2.1"

            }

```

Would be possible to define an arbitrary label whose value is dynamic? I mean on environment variables set in the host, or docker daemon labels.

In my particular case I wan to identify the host "hostname", because it allows me to filter monitoring data via cAdvisor.

I know there's a value named "node.id" but this value does not have any meaning for me and I cannot merge it with other values when filtering metrics.

In my case I have some metrics obtained from node-exporter, where I have the hostname, and I'm interested to have a single id for each node whose name is well known by me.

The result now can be seen in a dashboard I did for swarm based on cAdvisor+NodeExporter+Prometheus+Grafana: https://grafana.net/dashboards/609

A screenshot of what I've now can be seen here: https://grafana.net/api/dashboards/609/images/542/image

[Sebastiaan van Stijn]

You may be interested in this PR, which is working on “templating” service options;

https://github.com/docker/docker/pull/28025

Not sure if hostname is part of the template though (keep in mind that the hostname is not managed by Swarm, so

for that reason may not be part of the template; the node.id is the canonical identifier of a host)

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[basili...@softonic.com]

I know the node.id value, as I said. But as it's an internal value that does not have any meaning outside of the swarm cluster. For external tools is a useless value that does not provide any semantic. :(

Currently is the value I'm using to filter containers per host in my grafana panel, but as I cannot relate it with the hostname (which is a well know value) it's weird for the user to identify the host where something is happening. And I cannot obtain crossed metrics with other sources that provide node values based on the hostname.