Add info about repo_cleaner of ccdb-test (QC-276) (#319)

Author: Barthelemy

Framework/script/RepoCleaner/README.md

@@ -8,14 +8,16 @@ It is `repoCleaner.py`. See the long comment at the beginning.
 ./repoCleaner [--dry-run] [--log-level 10] [--config config.yaml]
 ```
 
-## Config
+## Configuration
 The file `config.yaml` contains the rules to be followed to clean up the database.
 It also contains the CCDB url.
 
+The configuration for ccdb-test is described [here](../../../doc/DevelopersTips.md). 
+
 ## Test
 `cd QualityControl/Framework/script/RepoCleaner ; python3 -m unittest discover`
 
 To run just one of the rules, do `python3 1_per_run.py`.
 
 ## Installation
-CMake will install the python scripts in bin and the config file in etc. 
+CMake will install the python scripts in bin and the config file in etc.

Framework/script/RepoCleaner/config.yaml

@@ -1,6 +1,6 @@
 Rules:
   - object_path: qc/ITS/ITSRawTask/.*
-    delay: 120
+    delay: 240
     policy: 1_per_run
   - object_path: qc/ITS/ITSRawTaskIBB1/.*
     delay: 120

doc/DevelopersTips.md

@@ -3,6 +3,16 @@
 This is a resource meant for the developers of the QC. Whenever we learn something useful we put it
 here. It is not sanitized or organized. Just a brain dump.
 
+## Where and how to configure the repo_cleaner of the ccdb-test 
+
+The config file is in `aldaqci@aidrefflp01:~/alice-ccdb/config.yaml`. Simply edit it and it will be picked up the next time the repo_cleaner runs. 
+
+The repo_cleaner is launched every 5 minutes by [Jenkins](https://alijenkins.cern.ch/job/FLP/job/CCDB%20Clean%20up/).
+
+It is a good practice to update [config.yaml](../Framework/script/RepoCleaner/config.yaml) in this repo when updating the file on `aidrefflp01`. 
+
+Documentation of the repo_cleaner can be found [here](../Framework/script/RepoCleaner/README.md).
+
 ### Trick used to load old data
 Until version 3 of the class MonitorObject, objects were stored in the repository directly. They are now stored within TFiles. The issue with the former way is that the StreamerInfo are lost. To be able to load old data, the StreamerInfos have been saved in a root file "streamerinfos.root". The CcdbDatabase access class loads this file and the StreamerInfos upon creation which allows for a smooth reading of the old objects. The day we are certain nobody will add objects in the old format and that the old objects have been removed from the database, we can delete this file and remove the loading from CcdbDatabase. Moreover, the following lines can be removed : 
 ```