docs: Add supported versions and fix-backport policy

Change-Id: I9ec43912652fc713484959e9315765f7e9d29a3e
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/README.md b/README.md
index f71649b4155d9f02978d3f40b12b5cf832cf9cd9..657cba85e45edbf031a6576fe5284ce0f2bcbf22 100644 (file)
--- a/README.md
+++ b/README.md
@@ -203,6 +203,23 @@ compiled in C++. To compile tracepoint probes in C++, you need
 G++ >= 4.7 or Clang >= 4.0. The C++ compilers need to support C++11.
 
 
+Supported versions
+------------------
+
+The LTTng project supports the last two released stable versions
+(e.g. stable-2.13 and stable-2.12).
+
+Fixes are backported from the master branch to the last stable version
+unless those fixes would break the ABI or API. Those fixes may be backported
+to the second-last stable version, depending on complexity and ABI/API
+compatibility.
+
+Security fixes are backported from the master branch to both of the last stable
+version and the the second-last stable version.
+
+New features are integrated into the master branch and not backported to the
+last stable branch.
+
 Contact
 -------