[BUGFIX] pyroscope: scope label lookups to the selected service

[luweglarz]

Description

The filter dropdowns in the Pyroscope query editor called LabelNames and LabelValues with only a time range and no matchers. Pyroscope narrows the blocks it reads on service_name alone, so an unscoped lookup scans every block in the range for every service. On a large deployment, one such request fans out into hundreds of internal calls and can exceed the query-backend concurrency limit

Changes

• computeLabelScopeSelector(service, profileType) builds the selector, andreturns an empty string when no service is set.
• useLabelNames / useLabelValues send it as matchers, include it in the query key, and stay disabled while it is empty.
• Filters takes optional service and profileType props and passes the selector to each filter row; the query editor supplies them.
• The request body type for the two calls now accepts string[] for matchers

Checklist

• Pull request has a descriptive title and context useful to a reviewer.
• Pull request title follows the [<catalog_entry>] <commit message> naming convention using one of the
  following catalog_entry values: FEATURE, ENHANCEMENT, BUGFIX, BREAKINGCHANGE, DOC,IGNORE.
• All commits have DCO signoffs.

[Copilot]

Copilot review overview

🟡 Changes recommended

Unescaped selector values can break dropdowns, and both lookup caches can retain results from an earlier time range.

Review effort: Balanced
Findings: 2

Open (2)

• Escape service and profile values in selector matchers · New
• Include time bounds in both scoped lookup cache keys · New

What changed in this PR

This PR scopes Pyroscope filter-label lookups to the selected service to avoid expensive unscoped searches.

Changes:

• Builds a service and optional profile-type selector.
• Sends that selector with label lookups and disables lookups when no service is selected.
• Passes the selector through the query editor and filter components.

File	Description
pyroscope/​src/​utils/​use-query.ts	Adds scoped label requests and query keys.
pyroscope/​src/​utils/​types.ts	Builds the lookup selector.
pyroscope/​src/​plugins/​pyroscope-profile-query/​PyroscopeProfileQueryEditor.tsx	Passes service and profile type to filters.
pyroscope/​src/​model/​pyroscope-client.ts	Allows matcher arrays in request bodies.
pyroscope/​src/​components/​LabelValue.tsx	Passes the selector to value lookups.
pyroscope/​src/​components/​LabelName.tsx	Passes the selector to name lookups.
pyroscope/​src/​components/​Filters.tsx	Computes and distributes the selector.
pyroscope/​src/​components/​FilterItem.tsx	Passes the selector to each dropdown.

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