fix: eliminate data race in plugin metrics middleware
A data race was detected when multiple goroutines accessed the `MetricsMiddleware`
simultaneously. The race occurred because a single `MetricsMiddleware` instance
was being shared across goroutines while its `BaseHandler` field was being
modified during middleware chain setup.
Fix by creating a new `MetricsMiddleware` instance for each middleware chain,
while safely sharing the thread-safe Prometheus metrics and plugin registry.
This maintains proper metrics collection while eliminating the mutable shared
state that caused the race condition.
Original error was detected here:
```
WARNING: DATA RACE
Read at 0x00c0039c0790 by goroutine 4486:
github.com/grafana/grafana-plugin-sdk-go/backend.(*ErrorSourceMiddleware).CallResource()
/Users/clord/src/grafana/irm-devstack/.devenv/state/go/pkg/mod/github.com/grafana/grafana-plugin-sdk-go@v0.261.0/backend/error_source_middleware.go:93 +0x40
github.com/grafana/grafana-plugin-sdk-go/backend.BaseHandler.CallResource()
...
```
* Refactor identity struct to store type in separate field
* Update ResolveIdentity to take string representation of typedID
* Add IsIdentityType to requester interface
* Use IsIdentityType from interface
* Remove usage of TypedID
* Remote typedID struct
* fix GetInternalID
* Plugins: Enhanced plugin instrumentation
* use backend.CallResourceResponseSenderFunc
* sdk v0.237.0
* support admission control
* cover all handlers in log and metrics middlewares
* fix after review
* Chore: Remove unused dependenices in plugin client middlewares
* refactor logger middleware to remove cfg dependency
* hack to make tracing work in api group builders
* add a middleware that appens headers for IP range AC to data source proxy requests
* update code
* add tests
* fix a mistake
* add logging
* refactor to reuse code
* small cleanup
* skip the plugins middleware if the header is already set
* skip the plugins middleware if the header is already set
* add feature toggle
* add a middleware that appens headers for IP range AC
* sort imports
* sign IP range header and only append it if the request is going to allow listed data sources
* sign a random generated string instead of IP, also change the name of the middleware to make it more generic
* remove the DS IP range AC options from the config file; remove unwanted change
* add test
* sanitize the URLs when comparing
* cleanup and fixes
* check if X-Real-Ip is present, and set the internal request header if it is not present
* use split string function from the util package
* Data query: Allo logging panel plugin id when executing queries
* Update tracing header middleware
* Test fix
* Add panelPluginType to query analytics
* Cleanup
Check embedded errors in query data response for plugin metrics/logs status label.
Plugin Request Completed log messages are now logged with info level if status=ok,
otherwise error level.
Fixes#76769
* Add teamHeaders for datasource proxy requests
* adds validation for the teamHeaders
* added tests for applying teamHeaders
* remove previous implementation
* validation for header values being set to authproxy
* removed unnecessary checks
* newline
* Add middleware for injecting headers on the data source backend
* renamed feature toggle
* Get user teams from context
* Fix feature toggle name
* added test for validation of the auth headers and fixed evaluation to cover headers
* renaming of teamHeaders to teamHTTPHeaders
* use of header set for non-existing header and add for existing headers
* moves types into datasources
* fixed unchecked errors
* Refactor
* Add tests for data model
* Update pkg/api/datasources.go
Co-authored-by: Victor Cinaglia <victor@grafana.com>
* Update pkg/api/datasources.go
Co-authored-by: Victor Cinaglia <victor@grafana.com>
---------
Co-authored-by: Alexander Zobnin <alexanderzobnin@gmail.com>
Co-authored-by: Victor Cinaglia <victor@grafana.com>
