chore: instrument external oauth2 requests (#11519)

* chore: instrument external oauth2 requests

External requests made by oauth2 configs are now instrumented into prometheus metrics.

coderd/provisionerdserver/provisionerdserver.go

@@ -32,7 +32,7 @@ import (
 	"github.com/coder/coder/v2/coderd/database/dbtime"
 	"github.com/coder/coder/v2/coderd/database/pubsub"
 	"github.com/coder/coder/v2/coderd/externalauth"
-	"github.com/coder/coder/v2/coderd/httpmw"
+	"github.com/coder/coder/v2/coderd/promoauth"
 	"github.com/coder/coder/v2/coderd/schedule"
 	"github.com/coder/coder/v2/coderd/telemetry"
 	"github.com/coder/coder/v2/coderd/tracing"
@@ -55,7 +55,7 @@ const (
 )
 
 type Options struct {
-	OIDCConfig          httpmw.OAuth2Config
+	OIDCConfig          promoauth.OAuth2Config
 	ExternalAuthConfigs []*externalauth.Config
 	// TimeNowFn is only used in tests
 	TimeNowFn func() time.Time
@@ -96,7 +96,7 @@ type server struct {
 	UserQuietHoursScheduleStore *atomic.Pointer[schedule.UserQuietHoursScheduleStore]
 	DeploymentValues            *codersdk.DeploymentValues
 
-	OIDCConfig httpmw.OAuth2Config
+	OIDCConfig promoauth.OAuth2Config
 
 	TimeNowFn func() time.Time
 
@@ -1736,7 +1736,7 @@ func deleteSessionToken(ctx context.Context, db database.Store, workspace databa
 
 // obtainOIDCAccessToken returns a valid OpenID Connect access token
 // for the user if it's able to obtain one, otherwise it returns an empty string.
-func obtainOIDCAccessToken(ctx context.Context, db database.Store, oidcConfig httpmw.OAuth2Config, userID uuid.UUID) (string, error) {
+func obtainOIDCAccessToken(ctx context.Context, db database.Store, oidcConfig promoauth.OAuth2Config, userID uuid.UUID) (string, error) {
 	link, err := db.GetUserLinkByUserIDLoginType(ctx, database.GetUserLinkByUserIDLoginTypeParams{
 		UserID:    userID,
 		LoginType: database.LoginTypeOIDC,

coderd/provisionerdserver/provisionerdserver_test.go

@@ -187,8 +187,8 @@ func TestAcquireJob(t *testing.T) {
 			srv, db, ps, _ := setup(t, false, &overrides{
 				deploymentValues: dv,
 				externalAuthConfigs: []*externalauth.Config{{
-					ID:           gitAuthProvider,
-					OAuth2Config: &testutil.OAuth2Config{},
+					ID:                       gitAuthProvider,
+					InstrumentedOAuth2Config: &testutil.OAuth2Config{},
 				}},
 			})
 			ctx, cancel := context.WithTimeout(context.Background(), testutil.WaitShort)