Add telegraf and go version to the internal input plugin

[adrianlzt]

Collecting telegraf version is useful to find outdated agents and match
behavioural changes with version changes.

closes #5958

Required for all PRs:

• Signed CLA.
• Associated README.md updated.
• Has appropriate unit tests.

[alvarolmedo]

+1

[glinton]

I feel like we should deprecate this bool and have a collect_include/collect_exclude filter with "memstats", and "runtime" as values.

[danielnelson]

Let's just skip the new option altogether, always send the new values.

[glinton]

Let's make this be internal_runtime and add collection for the other items dicussed here

[danielnelson]

I have a different take on this, I'll comment on the other issue but it doesn't need to be part of this PR. Here, let's add the Telegraf version as a tag on all existing metrics. With the Go version, I'm tempted to say we should just leave it out, but I suppose it wouldn't be a problem to add it as a go_version tag on internal_agent.

internal_agent,host=tyrion,version=1.12.0,go_version=1.12.5 foo=42
internal_write,output=file,host=tyrion,version=1.12.0 foo=42

[glinton]

Deprecate CollectMemstats and use an include/exclude filter

telegraf/plugins/inputs/docker_log/docker_log.go

Lines 81 to 82 in 4e59d51

	ContainerInclude []string `toml:"container_name_include"`
	ContainerExclude []string `toml:"container_name_exclude"`

telegraf/plugins/inputs/docker_log/docker_log.go

Line 398 in 4e59d51

filter, err := filter.NewIncludeExcludeFilter(d.ContainerInclude, d.ContainerExclude)

[danielnelson]

Let's just skip the new option altogether, always send the new values.

[glinton]

Resolves #5958
Resolves #5900

[glinton]

Just get the tests passing and this will be good to go

[raider111111]

Hi,

I updated to the latest version (1.12.0) but I'm not seeing the version tag. Is this only on specific counters?

The counters associated to the config:

     # The Telegraf Process Itself
     ObjectName = "Process"
     Instances = ["telegraf"]
     Counters = [
       "% Processor Time", "Working Set"
     ]
     Measurement = "win_process"

Suggestions?

[danielnelson]

The new tag is only added to the measurements from the internal input plugin.