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diff --git a/absl/log/internal/flags.h b/absl/log/internal/flags.h
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+// Copyright 2022 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: log/log_flags.h
+// -----------------------------------------------------------------------------
+//
+// This header declares set of flags which can be used to configure Abseil
+// Logging library behaviour at runtime.
+
+#ifndef ABSL_LOG_INTERNAL_FLAGS_H_
+#define ABSL_LOG_INTERNAL_FLAGS_H_
+
+#include <string>
+
+#include "absl/flags/declare.h"
+
+// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+// These flags should not be used in C++ code to access logging library
+// configuration knobs. Use interfaces defined in absl/log/globals.h
+// instead. It is still ok to use these flags on a command line.
+// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+// Log messages at this severity or above are sent to stderr in *addition* to
+// logfiles.  Defaults to `ERROR`.  See log_severity.h for numeric values of
+// severity levels.
+ABSL_DECLARE_FLAG(int, stderrthreshold);
+
+// Log messages at this severity or above are logged; others are discarded.
+// Defaults to `INFO`, i.e. log all severities.  See log_severity.h for numeric
+// values of severity levels.
+ABSL_DECLARE_FLAG(int, minloglevel);
+
+// If specified in the form file:linenum, any messages logged from a matching
+// location will also include a backtrace.
+ABSL_DECLARE_FLAG(std::string, log_backtrace_at);
+
+// If true, the log prefix (severity, date, time, PID, etc.) is prepended to
+// each message logged. Defaults to true.
+ABSL_DECLARE_FLAG(bool, log_prefix);
+
+#endif  // ABSL_LOG_INTERNAL_FLAGS_H_