feat(inputs.win_perf_counters): Add remote computers support

[vlastahajek]

Resolves #1899

Added support for reading performance counters from remote computers. User, under who is Telegraf running, must be already authenticated to the remote computer(s).

The support is added via additional optional global parameter Sources. This parameter can be also set for performance object to configure per host-specific performance counter:

[[inputs.win_perf_counters]]
  PreVistaSupport=false
  UseWildcardsExpansion=false
  UsePerfCounterTime=true
  CountersRefreshInterval="0"
  PrintValid=true
  # Names or ip addresses of remote computers to gather counters from, including local computer.
  # Telegraf's user must be already authenticated to the remote computers.
  # It can be overridden at the object level
  Sources=["localhost", "192.168.10.12"]

[[inputs.win_perf_counters.object]]
   # Overrides the Sources global parameter for current performance object.
    Sources = ["192.168.1.68"]
    # Processor usage, alternative to native, reports on a per core.
    ObjectName = "Processor"
    Instances = ["*"]
    Counters = [
      "% Processor Time",
    ]
    Measurement = "win_cpu"

It allows to define the same configuration for multiple computers and also different configurations per computer.

Computer name is then added as the source tag. Telegraf host compuper has the source set to the computer name.

Readme has been also enhanced with plugins's schema description.

Required for all PRs:

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

[DmitryMaletin]

Is there any ETA that PR will be merged?

[powersj]

@vlastahajek are you interested in continuing this? Looks like a rebase on master to resolve some conflicts, and then a few outstanding points are what is left.

[vlastahajek]

@powersj, OK. I will look at this later this week or at the beginning of the next week.

[vlastahajek]

It's ready.

[telegraf-tiger]

Download PR build artifacts for linux_amd64.tar.gz, darwin_amd64.tar.gz, and windows_amd64.zip.
Downloads for additional architectures and packages are available below.

⚠️ This pull request increases the Telegraf binary size by 2.56 % for linux amd64 (new size: 142.4 MB, nightly size 138.9 MB)

📦 Click here to get additional PR build artifacts

Artifact URLs

DEB	RPM	TAR GZ	ZIP
amd64.deb	aarch64.rpm	darwin_amd64.tar.gz	windows_amd64.zip
arm64.deb	armel.rpm	darwin_arm64.tar.gz	windows_i386.zip
armel.deb	armv6hl.rpm	freebsd_amd64.tar.gz
armhf.deb	i386.rpm	freebsd_armv7.tar.gz
i386.deb	ppc64le.rpm	freebsd_i386.tar.gz
mips.deb	riscv64.rpm	linux_amd64.tar.gz
mipsel.deb	s390x.rpm	linux_arm64.tar.gz
ppc64el.deb	x86_64.rpm	linux_armel.tar.gz
riscv64.deb		linux_armhf.tar.gz
s390x.deb		linux_i386.tar.gz
		linux_mips.tar.gz
		linux_mipsel.tar.gz
		linux_ppc64le.tar.gz
		linux_riscv64.tar.gz
		linux_s390x.tar.gz
		static_linux_amd64.tar.gz

[sspaink]

I moved these changes to a local branch and created a new pull request: #11090. At the moment we are waiting for customer/community participation to help ensure this change meets their needs (configuration makes sense, etc.). Therefore we will need to be able to re-base it and get new build artifacts on request, moving this pull request to be under a local branch seems like the best approach.

Thank you @vlastahajek for all your work on this and quick responses, I will be closing this pull request so you aren't responsible anymore for helping us re-base it while we wait.