feat(inputs.opcua_listener): Add monitoring params

[reindlt]

Required for all PRs

• Updated associated README.md.
• Wrote appropriate unit tests.
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resolves #13891

new structs have been added to input client representing monitoring and data change filter parameters

new function has been added to subscribe client in order to override default values for parameters that have been specified in the config

monitoring parameters have been added to existing tests for subscribe client

[powersj]

Hi,

Thank you very much for the PR! I have a few comments and questions below for you to review.

Thanks!

[telegraf-tiger]

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[powersj]

Thanks!

[srebhan]

Thanks for your contribution @reindlt. Only two minor comments from my side...

[reindlt]

@srebhan thanks for taking over the corrections.

It seems that the failed checks are not related to changes within this PR.

[JeroenVanHoye]

Hi,
Does this feature work? Because when adding the monitoring parameters like this to a nodeconfig inside a group, I get the following error. I just copied the config from the example. When I remove the monitoring_params completely the config works.

Config:
{name="Val_PV", identifier="0:08TT20402.HMI.Val_PV", monitoring_params={sampling_interval="0s", queue_size=10, discard_oldest=true, data_change_filter={trigger="Status", deadband_type="Absolute", deadband_value=0.0}}},

Error:
error parsing opcua_listener, line 50: (input.NodeSettings.MonitoringParams) cannot unmarshal TOML array table into input.MonitoringParameters (need slice)

[srebhan]

@JeroenVanHoye please do not comment on old PR but open a new issue with your (redacted) config and the corresponding log...