feat(cirrus): Set glean max event buffer value

.env.integration-tests

@@ -53,3 +53,4 @@ CIRRUS_CHANNEL=release
 CIRRUS_FML_PATH=./feature_manifest/sample.yml
 CIRRUS_SENTRY_DSN=
 CIRRUS_ENV_NAME=test_instance_stage
+CIRRUS_GLEAN_MAX_EVENTS_BUFFER=1

.env.sample

@@ -58,3 +58,4 @@ CIRRUS_FML_PATH=./feature_manifest/sample.yml
 CIRRUS_SENTRY_DSN=
 CIRRUS_INSTANCE_NAME=
 CIRRUS_ENV_NAME=test_instance_stage
+CIRRUS_GLEAN_MAX_EVENTS_BUFFER=20

.env.test

@@ -7,3 +7,4 @@ CIRRUS_FML_PATH=./tests/feature_manifest/sample.fml.yaml
 CIRRUS_SENTRY_DSN=
 CIRRUS_INSTANCE_NAME=test_instance
 CIRRUS_ENV_NAME=test_instance_stage
+CIRRUS_GLEAN_MAX_EVENTS_BUFFER=1

cirrus/README.md

@@ -26,6 +26,7 @@ To set up the Cirrus environment, follow these steps:
    CIRRUS_SENTRY_DSN=dsn_url
    CIRRUS_INSTANCE_NAME=cirrus_pod_app_v1
    CIRRUS_ENV_NAME=test_app_stage
+   CIRRUS_GLEAN_MAX_EVENTS_BUFFER=10
 
    ```
 
@@ -40,6 +41,7 @@ To set up the Cirrus environment, follow these steps:
    - `CIRRUS_SENTRY_DSN`: Replace `dsn_url` with the appropriate DSN value.
    - `CIRRUS_INSTANCE_NAME`: Replace with the instance name.
    - `CIRRUS_ENV_NAME:` Replace with the concatenation of project and environment name
+   - `CIRRUS_GLEAN_MAX_EVENTS_BUFFER`: This value represents the max events buffer size for glean. You can set the value from range 1 to 500, by default Cirrus sets it to 10.
 
    Adjust the values of these variables according to your specific configuration requirements.
 

cirrus/server/cirrus/settings.py

@@ -30,6 +30,9 @@
     str, config("CIRRUS_INSTANCE_NAME", default="instance name not defined")
 )
 env_name = cast(str, config("CIRRUS_ENV_NAME", default="production"))
+glean_max_events_buffer: int = int(
+    config("CIRRUS_GLEAN_MAX_EVENTS_BUFFER", default=10)  # type: ignore
+)
 
 
 @dataclass
@@ -39,7 +42,7 @@ class MetricsConfiguration:
     channel: str = channel
     data_dir: str = "/var/glean"
     log_level: Union[str, int] = logging.getLevelName("WARNING")
-    max_events_buffer: int = 500
+    max_events_buffer: int = glean_max_events_buffer
     server_endpoint: Optional[str] = None
     upload_enabled: bool = True
     version: str = "1.0"