fix: convert message from info to debug logging (#99)

* Update README with groups exporter information

* fix: convert message from info to debug logging

Author: jnywong

README.md

@@ -38,8 +38,14 @@ jupyterhub-cost-monitoring:
       value: "<name-of-cluster>"
 ```
 
+### AWS IAM Role Configuration
+
 An example of configuring an AWS IAM role to talk to the AWS Cost Explorer API can be found in the [2i2c Infrastructure Guide](https://infrastructure.2i2c.org/topic/billing/cost-monitoring-system/).
 
+### Groups Exporter
+
+For group costs, [`jupyterhub-groups-exporter](https://github.com/2i2c-org/jupyterhub-groups-exporter) needs to be installed. This is an exporter that exposes JupyterHub user group information to Prometheus.
+
 ## Documentation
 
 Documentation can be found at [https://jupyterhub-cost-monitoring.readthedocs.io/en/latest/](https://jupyterhub-cost-monitoring.readthedocs.io/en/latest/)

src/jupyterhub_cost_monitoring/query_cost_aws.py

@@ -628,7 +628,7 @@ def query_total_costs_per_group(
     response = {}
     for r in results:
         key = (r["date"], r["usergroup"])
-        logger.info(f"Key: {key}, Value: {r['value']}")
+        logger.debug(f"Key: {key}, Value: {r['value']}")
         response[key] = response.get(key, 0) + float(r["value"])
 
     final_response = [