Switch to using separate rapids-logger repo (#1774)

This PR removes rmm's logger code in favor of using the [rapids-logger repo](https://github.com/rapidsai/rapids-logger) to which that code was moved. The main material change is that with the latest commit on that repo rmm will dump output to stderr instead of to a file by default, which was the generally requested behavior and also aligns with the rest of RAPIDS's loggers pre-rapids-logger. Nonetheless, I've marked that as a breaking change (also because the rapids-logger code is no longer available from this repository).

Contributes to rapidsai/build-planning#104.

Authors:
  - Vyas Ramasubramani (https://github.com/vyasr)

Approvers:
  - Bradley Dice (https://github.com/bdice)

URL: #1774

.gitignore

@@ -155,9 +155,6 @@ ENV/
 # mypy
 .mypy_cache/
 
-# RMM log files
-rmm_log.txt
-
 # cibuildwheel
 /wheelhouse
 

CMakeLists.txt

@@ -1,5 +1,5 @@
 # =============================================================================
-# Copyright (c) 2018-2024, NVIDIA CORPORATION.
+# Copyright (c) 2018-2025, NVIDIA CORPORATION.
 #
 # 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
@@ -73,10 +73,10 @@ rapids_find_package(
 # add third party dependencies using CPM
 rapids_cpm_init()
 
-add_subdirectory(rapids_logger)
+CPMAddPackage(
+  NAME rapids_logger GITHUB_REPOSITORY rapidsai/rapids-logger GIT_SHALLOW FALSE GIT_TAG
+  1043e0f3989d75ad52f5212544b8154777e86fc9 VERSION 1043e0f3989d75ad52f5212544b8154777e86fc9)
 rapids_make_logger(rmm EXPORT_SET rmm-exports)
-add_library(rmm::rmm_logger ALIAS rmm_logger)
-add_library(rmm::rmm_logger_impl ALIAS rmm_logger_impl)
 
 include(cmake/thirdparty/get_cccl.cmake)
 include(cmake/thirdparty/get_nvtx.cmake)

README.md

@@ -647,8 +647,8 @@ set to `True`. The log file name can be set using the `log_file_name` parameter.
 
 RMM includes a debug logger which can be enabled to log trace and debug information to a file. This
 information can show when errors occur, when additional memory is allocated from upstream resources,
-etc. The default log file is `rmm_log.txt` in the current working directory, but the environment
-variable `RMM_DEBUG_LOG_FILE` can be set to specify the path and file name.
+etc. By default output is logged to stderr, but the environment variable
+`RMM_DEBUG_LOG_FILE` can be set to specify a path and file name to dump the logs to instead.
 
 There is a CMake configuration variable `RMM_LOGGING_LEVEL`, which can be set to enable compilation
 of more detailed logging. The default is `INFO`. Available levels are `TRACE`, `DEBUG`, `INFO`,