[errors] de-specialize Transient in favor of Tags.

logdog/client/butler/output/pubsub/pubsubOutput.go

 // Copyright 2015 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package pubsub
 
 import (
         "bytes"
         "fmt"
         "sync"
@@ skipping 187 matching lines @@
                 ctx := o.Context
                 if o.RPCTimeout > 0 {
                         var cancelFunc context.CancelFunc
                         ctx, cancelFunc = clock.WithTimeout(o, o.RPCTimeout)
                         defer cancelFunc()
                 }
 
                 messageID, err = o.Topic.Publish(ctx, message)
                 if err == context.DeadlineExceeded {
                         // If we hit our publish deadline, retry.
-                        err = errors.WrapTransient(err)
+                        err = retry.Tag.Apply(err)
                 } else {
                         err = grpcutil.WrapIfTransient(err)
                 }
                 return
         }, func(err error, d time.Duration) {
                 log.Fields{
                         log.ErrorKey: err,
                         "delay":      d,
                 }.Warningf(o, "TRANSIENT error publishing messages; retrying...")
                 transientErrors++
@@ skipping 29 matching lines @@
 // a maximum backoff.
 func indefiniteRetry() retry.Iterator {
         return &retry.ExponentialBackoff{
                 Limited: retry.Limited{
                         Retries: -1,
                         Delay:   500 * time.Millisecond,
                 },
                 MaxDelay: 30 * time.Second,
         }
 }