fix(inputs.gnmi): Allow to disable using first namespace as origin

[srebhan]

Summary

Due to previous issues with devices reporting the origin of a response in the first element of the path, previous attempts (e.g. PR #14838) simply used the namespace of the first path element as origin if any. However, this will always override the origin even if it was specified correctly by the device. Furthermore, this approach will simply convert valid namespaces of elements to an origin which is wrong.

This PR introduces a new option called enforce_first_namespace_as_origin which by default keeps the current approach but allows to disable the behavior to not mangle the origin any longer.

Caution

Disabling enforce_first_namespace_as_origin will no longer be mangled the response path and therefore the path tag might change! This might cause existing queries to break and might increase the cardinality in your database!

Checklist

• No AI generated code was used in this PR

Related issues

resolves #16476

[whizkidTRW]

I can confirm this fixed the issue. Thanks @srebhan!

etc % ~/dev/devops/telegraf/bin/telegraf-1.34.0/usr/bin/telegraf --config telegraf.conf --config-directory ./telegraf.d --test-wait 45
2025-02-11T17:06:22Z I! Loading config: telegraf.conf
2025-02-11T17:06:22Z I! Loading config: telegraf.d/ciena.conf
2025-02-11T17:06:22Z W! DeprecationWarning: Option "fieldpass" of plugin "inputs.gnmi" deprecated since version 1.29.0 and will be removed in 1.40.0: use 'fieldinclude' instead
2025-02-11T17:06:22Z I! Starting Telegraf 1.34.0-a62ffed9 brought to you by InfluxData the makers of InfluxDB
2025-02-11T17:06:22Z I! Available plugins: 236 inputs, 9 aggregators, 33 processors, 26 parsers, 63 outputs, 5 secret-stores
2025-02-11T17:06:22Z I! Loaded inputs: gnmi
2025-02-11T17:06:22Z I! Loaded aggregators:
2025-02-11T17:06:22Z I! Loaded processors: converter rename strings
2025-02-11T17:06:22Z I! Loaded secretstores:
2025-02-11T17:06:22Z W! Outputs are not used in testing mode!
2025-02-11T17:06:22Z I! Tags enabled: host=XXX.XXX.XXX.XXX
> interface,agent_host=XXX.XXX.XXX.XXX,host=XXX.XXX.XXX.XXX,ifIndex=5 ifHCInOctets=0u,ifHCOutOctets=0u,ifInCrcErrors=0u,ifInDiscards=0u,ifInErrors=0u,ifOutErrors=0u 1739293587842000000
> interface,agent_host=XXX.XXX.XXX.XXX,host=XXX.XXX.XXX.XXX,ifIndex=6 ifHCInOctets=0u,ifHCOutOctets=0u,ifInCrcErrors=0u,ifInDiscards=0u,ifInErrors=0u,ifOutErrors=0u 1739293587842000000
> interface,agent_host=XXX.XXX.XXX.XXX,host=XXX.XXX.XXX.XXX,ifIndex=7 ifHCInOctets=0u,ifHCOutOctets=0u,ifInCrcErrors=0u,ifInDiscards=0u,ifInErrors=0u,ifOutErrors=0u 1739293587842000000
> interface,agent_host=XXX.XXX.XXX.XXX,host=XXX.XXX.XXX.XXX,ifIndex=8 ifHCInOctets=0u,ifHCOutOctets=0u,ifInCrcErrors=0u,ifInDiscards=0u,ifInErrors=0u,ifOutErrors=0u 1739293587843000000
> interface,agent_host=XXX.XXX.XXX.XXX,host=XXX.XXX.XXX.XXX,ifIndex=9 ifHCInOctets=0u,ifHCOutOctets=0u,ifInCrcErrors=0u,ifInDiscards=0u,ifInErrors=0u,ifOutErrors=0u 1739293587843000000
> interface,agent_host=XXX.XXX.XXX.XXX,host=XXX.XXX.XXX.XXX,ifIndex=10 ifHCInOctets=0u,ifHCOutOctets=0u,ifInCrcErrors=0u,ifInDiscards=0u,ifInErrors=0u,ifOutErrors=0u 1739293587843000000

. . . output trimmed for clarity . . .

> interface,agent_host=XXX.XXX.XXX.XXX,host=XXX.XXX.XXX.XXX,ifIndex=34 ifHCInOctets=381756983492179u,ifHCOutOctets=5107627111593420u,ifInCrcErrors=0u,ifInDiscards=6189278u,ifInErrors=0u,ifOutErrors=0u 1739293617854000000
> interface,agent_host=XXX.XXX.XXX.XXX,host=XXX.XXX.XXX.XXX,ifIndex=35 ifHCInOctets=0u,ifHCOutOctets=0u,ifInCrcErrors=0u,ifInDiscards=0u,ifInErrors=0u,ifOutErrors=0u 1739293617854000000
> interface,agent_host=XXX.XXX.XXX.XXX,host=XXX.XXX.XXX.XXX,ifIndex=36 ifHCInOctets=9938576476700818u,ifHCOutOctets=1608677608870946u,ifInCrcErrors=3453010u,ifInDiscards=4980248u,ifInErrors=3453011u,ifOutErrors=0u 1739293617854000000

[telegraf-tiger]

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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_arm64.zip
armel.deb	armv6hl.rpm	freebsd_amd64.tar.gz	windows_i386.zip
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