internal/lsp/cmd: partially revert "add a flag to disable telemetry"

This reverts commit 17a19b5. The revert
is partial because that change also added the -short flag when running
govim tests, which we preserve as without this the tests often time-out
(and I don't want to increase our test timeout right now).

Reason for revert: telemetry races have been fixed in https://golang.org/cl/226317

Change-Id: I5fcf034c1fe6e2db48994e2f06b73a593c779e54
Reviewed-on: https://go-review.googlesource.com/c/tools/+/231637
Run-TryBot: Robert Findley <[email protected]>
Reviewed-by: Rebecca Stambler <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>

Author: findleyr

gopls/integration/govim/run_tests_for_cloudbuild.sh

@@ -9,10 +9,6 @@
 # build step. We do this so that we can capture govim test artifacts regardless
 # of the test results.
 
-# See golang.org/issues/38042. Temporarily disable telemetry until event
-# exporters are threadsafe.
-export GOVIM_GOPLS_FLAGS="-telemetry.disable"
-
 # Substitute the locally built gopls binary for use in govim integration tests.
 go test -short ./cmd/govim -gopls /workspace/gopls/gopls
 

internal/lsp/cmd/serve.go

@@ -12,7 +12,6 @@ import (
 	"strings"
 	"time"
 
-	"golang.org/x/tools/internal/event"
 	"golang.org/x/tools/internal/jsonrpc2"
 	"golang.org/x/tools/internal/lsp/cache"
 	"golang.org/x/tools/internal/lsp/debug"
@@ -35,7 +34,6 @@ type Serve struct {
 	RemoteListenTimeout time.Duration `flag:"remote.listen.timeout" help:"when used with -remote=auto, the listen.timeout used when auto-starting the remote"`
 	RemoteDebug         string        `flag:"remote.debug" help:"when used with -remote=auto, the debug address used when auto-starting the remote"`
 	RemoteLogfile       string        `flag:"remote.logfile" help:"when used with -remote=auto, the filename for the remote daemon to log to"`
-	DisableExport       bool          `flag:"telemetry.disable" help:"TEMPORARY WORKAROUND: disable telemetry processing entirely. This flag will be removed in the future, once telemetry issues are resolved."`
 
 	app *Application
 }
@@ -62,12 +60,6 @@ func (s *Serve) Run(ctx context.Context, args ...string) error {
 		return tool.CommandLineErrorf("server does not take arguments, got %v", args)
 	}
 
-	// Temporary workaround for golang.org/issues/38042: allow disabling
-	// telemetry export.
-	if s.DisableExport {
-		event.SetExporter(nil)
-	}
-
 	di := debug.GetInstance(ctx)
 	if di != nil {
 		closeLog, err := di.SetLogFile(s.Logfile)