Source available metrics (#24879)

* Expose metrics under a source available license

* do not assume Cluster()

* allow metrics if licensed or dev

* temporary vet override

* simplify BULID_TAGS handling

* auto clean old imports.go

* fix license listener

* e2e test metrics & license semantics

* update from enterprise

* switch back to mattermost-govet/v2@new now

* update metrics from upstream

* Update license_spec.js

Co-authored-by: Saturnino Abril <saturnino.abril@gmail.com>

* Update license_spec.js

Co-authored-by: Saturnino Abril <saturnino.abril@gmail.com>

* Update e2e-tests/cypress/tests/integration/channels/enterprise/metrics/license_spec.js

Co-authored-by: Saturnino Abril <saturnino.abril@gmail.com>

* Update e2e-tests/cypress/tests/integration/channels/enterprise/metrics/license_spec.js

* split up specs

* require/delete license earlier in e2e test

* expanded expect to debug failures

* more logging

* Revert "more logging"

This reverts commit 0bc513fd926c07a0c6050f4b4c742e856d8dc435.

* e2e: try deleting license first

* update from enterprise

* toggleMetricsOn to work around license delete

* eslint

* ensure admin before deleting license

* update from enterprise

* updates from enterprise

* fix cypress logging

* temp: log at DEBUG for Cypress tests

---------

Co-authored-by: Saturnino Abril <saturnino.abril@gmail.com>
Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/app/platform/service.go

@@ -323,11 +323,10 @@ func New(sc ServiceConfig, options ...Option) (*PlatformService, error) {
 	}
 
 	ps.AddLicenseListener(func(oldLicense, newLicense *model.License) {
-		if (oldLicense == nil && newLicense == nil) || !ps.startMetrics {
-			return
-		}
+		wasLicensed := (oldLicense != nil && *oldLicense.Features.Metrics) || (model.BuildNumber == "dev")
+		isLicensed := (newLicense != nil && *newLicense.Features.Metrics) || (model.BuildNumber == "dev")
 
-		if oldLicense != nil && newLicense != nil && *oldLicense.Features.Metrics == *newLicense.Features.Metrics {
+		if wasLicensed == isLicensed || !ps.startMetrics {
 			return
 		}
 

server/channels/imports/placeholder.go

@@ -1,8 +0,0 @@
-// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
-// See LICENSE.txt for license information.
-
-// As part of the enterprise code integration machinery a go file is copied to
-// this package, this file ensure the existence of the package anyway, allowing
-// the rest of the code to import the package when enterprise code is there and
-// when is not.
-package imports