Tag History Indirect Binding

[pturmel]

@PFollansbee

how do you know this?

Experience. History paths are poorly documented.

Some related topics:

Is the extended tag path format for history queries documented?

I was doing some hackish things with a history DB, and landed in a situation where I could no longer see the history for one specific tag using system.tag.queryTagHistory. Just to make sure I wasn't fumbling a parameter, I tried a history binding in Perspective for the same tag and it worked. Then I noticed that the designer UI had built the tag path in a form I've never seen documented. I tried that path with queryTagHistory and it got data. I was using a more simple: my_hist = system.tag.qu…

Historian Tag Path Syntax Format

I am laying out some foundational work. I came across two valid syntax of Historian Tag Path: short version: DB_GW_A01/gw_maker:default]wm01 long version: histprov:DB_GW_A01:/drv:gw_maker:default:/tag:wm01 From your experience. Which one is more acceptable?

Remote Tag Provider History Queries

I'm working on a couple tasks related to historians and history queries, and have encountered some behaviors of remote tag providers (RTPs) that have me stymied: There's no public way to retrieve the gateway name that a RTP is pointing at, nor any public way to retrieve the far end's real tag provider name. (Reflection has exposed com.inductiveautomation.ignition.gateway.tags.distributed.client.RemoteTagProvider and com.inductiveautomation.metro.api.ServerId to me, and a number of private fie…