rock: override built-in metrics

The ability to override built-in modules was introduced with [1].
After [2], metrics will be embedded to core Tarantool. The ability to
override them with installed rock will make it possible to use old
Tarantool with new metrics.

1. tarantool/tarantool#7774
2. tarantool/tarantool#7725

Closes tarantool/tarantool#7727

.github/workflows/packaging.yml

@@ -21,9 +21,7 @@ jobs:
         with:
           module-name: 'metrics'
           version-pre-extraction-hook: |
-            local rock_utils = require('test.rock_utils')
-            rock_utils.remove_builtin('metrics')
-            rock_utils.assert_nonbuiltin('metrics')
+            require('test.rock_utils').assert_nonbuiltin('metrics')
 
   package:
     # Skip pull request jobs when the source branch is in the same

.github/workflows/push_rockspec.yml

@@ -24,9 +24,7 @@ jobs:
         with:
           module-name: 'metrics'
           version-pre-extraction-hook: |
-            local rock_utils = require('test.rock_utils')
-            rock_utils.remove_builtin('metrics')
-            rock_utils.assert_nonbuiltin('metrics')
+            require('test.rock_utils').assert_nonbuiltin('metrics')
 
   push-scm-rockspec:
     runs-on: [ ubuntu-20.04 ]

.gitignore

@@ -17,3 +17,4 @@ doc/locale/en/
 *.lua.c
 
 build.luarocks
+packpack

CHANGELOG.md

@@ -23,6 +23,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - simultaneous `include` and `exclude` arguments
     (`exclude` has higher priority)
 - Build rock with cmake
+- Override built-in metrics, if installed
 
 ### Deprecated
 - Passing nonexistent metrics to `enable_default_metrics()`

CMakeLists.txt

@@ -18,3 +18,8 @@ install(
   DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/cartridge
   DESTINATION ${TARANTOOL_INSTALL_LUADIR}
 )
+
+install(
+  DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/${PROJECT_NAME}
+  DESTINATION ${TARANTOOL_INSTALL_LUADIR}/override
+)

rpm/tarantool-metrics.spec

@@ -23,10 +23,13 @@ Easy collecting, storing and manipulating metrics timeseriess.
 mkdir -p %{br_luapkgdir}
 cp -rv metrics %{br_luapkgdir}
 cp -rv cartridge %{br_luapkgdir}
+mkdir %{br_luapkgdir}/override
+cp -rv metrics %{br_luapkgdir}/override
 
 %files
      %{luapkgdir}/metrics
      %{luapkgdir}/cartridge
+     %{luapkgdir}/override
 
 %doc README.md
 %doc doc/monitoring/getting_started.rst