stack/erp5: supports disable apachedex score promise

This was sometimes causing false positives, for example if site have
only one hit and this hit takes more than one second, apdex is 0% and
promise failed, it seems useful to at least have a way to disable.

We are discussed on !1716 (comment 225941)
an idea of introducing a "minimal number of hits" parameter to not
detect this false positive on sites that are not accessed enough to
calculate a meaningful apdex.

software/erp5/instance-erp5-input-schema.json

@@ -798,7 +798,7 @@
         },
         "apachedex-promise-threshold": {
           "type": "number",
-          "title": "Promise fails if the overall Apdex score for the previous day is below than this value.",
+          "title": "Promise fails if the overall Apdex score for the previous day is below than this value. A value of 0 disables the promise.",
           "default": 70,
           "minimum": 0,
           "maximum": 100

software/erp5/test/test/test_balancer.py

@@ -104,7 +104,7 @@ class BalancerTestCase(ERP5InstanceTestCase):
             '--js-embed',
             '--quiet',
           ],
-        'apachedex-promise-threshold': 100,
+        'apachedex-promise-threshold': 0,
         'haproxy-server-check-path': '/',
         'zope-family-dict': {
             'default': ['dummy_http_server'],

stack/erp5/buildout.hash.cfg

@@ -94,7 +94,7 @@ md5sum = 9c580be982d8c63ec06fc273ef3cb971
 
 [template-balancer]
 filename = instance-balancer.cfg.in
-md5sum = 409a7505548576ebf0e4d5cc218e0753
+md5sum = f7a9b3450f9682ef11195fe2a7c3dad6
 
 [template-haproxy-cfg]
 filename = haproxy.cfg.in

stack/erp5/instance-balancer.cfg.in

@@ -525,11 +525,13 @@ apache-log-list = ${rsyslogd-cfg-parameter-dict:access-log-file}
 configuration = ${monitor-apachedex-report-config:output}
 promise-threshold = {{ slapparameter_dict['apachedex-promise-threshold'] }}
 
+{%if slapparameter_dict['apachedex-promise-threshold'] %}
 [{{ section('monitor-promise-apachedex-result') }}]
 <= monitor-promise-base
 promise = check_command_execute
 name = check-apachedex-result.py
 config-command = "{{ parameter_dict['promise-check-apachedex-result'] }}" --apachedex_path "${directory:apachedex}" --status_file ${monitor-directory:private}/apachedex.report.json --threshold "${apachedex-parameters:promise-threshold}"
+{% endif %}
 
 [{{ section('promise-check-computer-memory') }}]
 <= monitor-promise-base