Tempo: Add time range to tags and tag value requests #107872
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| The **Tags time range** modifies how tags queries are run. | ||
| When enabled, tags and tag values queries will include the time range. | ||
| This setting is disabled by default. | ||
| The start time is set to 15 minutes before end time to avoid searching over a long range of time while still allowing users to retrieve tags and tag values in the past. |
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Might be only me but my first impression was that start time is shifted but it seems like it's the other way round: "start time matches the start time in. the current time range and the end time is set to 15 minutes after the start".
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Also it's used only with v2, not sure if need to mention it.
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Made some updates here but didn't actually mention anything about v1 / v2. It's been a long time since we made any changes to v1. We should really remove v1 as it's from a much older Tempo version.
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I tried it in Explore and the range is applied nicely on load, but doesn't seem to be updated if the range changes: Screen.Recording.2025-07-10.at.13.56.57.movLoki plugin is doing this but checking if time range provided to the component changed: |
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| | Name | Description | | ||
| | ----------------- | ---------------------------------------- | | ||
| | **Last 30 mins** | Last 30 mins of selected range. `1800` | |
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Code scanning / Vale
Did you really mean 'mins'? The Grafana dictionary might not know of this word yet
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@ifrost in terms of listening for changes and recalling the endpoint - initially I felt like this could be too much for the user to be calling the tags again when the time range is changed (and instead refresh) but it's just going to be more confusing to do that so I've pushed a commit to listen for changes! |
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Works as expected 👍
I wasn't sure about changing the signature of the abstract LanguageProvider.start(...). Also it's not "start" any more as can be called multiple times changing it's behavior. But it seems language providers live their own life anyway and that abstract class is pointless anyway.
public/app/plugins/datasource/tempo/configuration/TagsTimeRangeSettings.tsx
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| // Check if we need to refetch tags due to range changes (minute-level granularity) | ||
| const shouldRefetch = this.shouldRefreshLabels(range, this.previousRange); | ||
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| if (!this.startTask || shouldRefetch) { |
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Could this cause issues if the previous request is still pending? Do we cancel ongoing requests?
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Testing it out it does not seem to cause issue, just creates another request if the range changes before the other one returns. I don't think Tempo allows us to cancel requests.
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Just a nitpick: is there a reason for adding the Tags time range above rather than next to the Tag limit (above or below)? It feels that the 2 options should go together. 
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What is this feature?
Adds time range to tags and tag value requests, which can be configured in the data source settings.
Why do we need this feature?
Users may have tags or tag values that existed at a time in the past, rather than the last 15 minutes.
Who is this feature for?
Tempo users.
Which issue(s) does this PR fix?:
Fixes #81916