pdoerner
diff --git a/Diff for: ‎common/log/tag/tags.go
+3 b/Diff for: ‎common/log/tag/tags.go
+3
diff --git a/Diff for: ‎common/softassert/softassert.go
+48 b/Diff for: ‎common/softassert/softassert.go
+48
@@ -568,6 +568,9 @@ func WorkerComponent(v interface{}) ZapTag {
 	return NewStringTag("worker-component", fmt.Sprintf("%T", v))
 }
 
+// FailedAssertion is a tag for marking a message as a failed assertion.
+var FailedAssertion = NewBoolTag("failed-assertion", true)
+
 // history engine shard
 
 // ShardID returns tag for ShardID
 
@@ -0,0 +1,48 @@
+// The MIT License
+//
+// Copyright (c) 2025 Temporal Technologies Inc.  All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package softassert
+
+import (
+	"go.temporal.io/server/common/log"
+	"go.temporal.io/server/common/log/tag"
+)
+
+// That performs a soft assertion by logging an error if the given condition is false.
+// It is meant to indicate a condition that are always expected to be true.
+// Returns true if the condition is met, otherwise false.
+//
+// Example:
+// softassert.That(logger, object.state == "ready", "object is not ready")
+//
+// Best practices:
+// - Use it to check for programming errors and invariants.
+// - Use it to communicate assumptions about the code.
+// - Use it to abort or recover from an unexpected state.
+// - Never use it as a substitute for regular error handling, validation, or control flow.
+func That(logger log.Logger, condition bool, msg string) bool {
+	if !condition {
+		// By using the same prefix for all assertions, they can be reliably found in logs.
+		logger.Error("failed assertion: "+msg, tag.FailedAssertion)
+	}
+	return condition
+}
Original file line number	Diff line number	Diff line change
`@@ -568,6 +568,9 @@ func WorkerComponent(v interface{}) ZapTag {`
`568`	`568`	`return NewStringTag("worker-component", fmt.Sprintf("%T", v))`
`569`	`569`	`}`
`570`	`570`
	`571`	`+// FailedAssertion is a tag for marking a message as a failed assertion.`
	`572`	`+var FailedAssertion = NewBoolTag("failed-assertion", true)`
	`573`	`+`
`571`	`574`	`// history engine shard`
`572`	`575`
`573`	`576`	`// ShardID returns tag for ShardID`