feat: Add dotnet_events to the usage report

[haacked]

This adds the tracking of events from the posthog-dotnet library to the usage report.

Changes

Added dotnet_events, teams_with_dotnet_events_count_in_period, dotnet_events_count_in_period to usage_report.py

Does this work well for both Cloud and self-hosted?

Yes

How did you test this code?

Tried to run the usage report locally. No errors. Wasn't able to confirm results.

[greptile-apps]

PR Summary

Added support for tracking events from the posthog-dotnet library in the usage report, enabling visibility into .NET SDK usage alongside other client libraries.

• Added dotnet_events_count_in_period field to the UsageReportCounters dataclass in /posthog/tasks/usage_report.py
• Added condition to identify events from the posthog-dotnet library in the SQL query that categorizes events by source
• Added dotnet_events to the metrics dictionary that collects SDK usage statistics
• Included the new metric in team report generation to ensure it's properly tracked and reported

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[dmarticus]

seems reasonable to me, but I'd get an opinion from @zlwaterfield or someone else in growth before merging.

[zlwaterfield]

Looks good

[haacked]

Thanks @zlwaterfield. It looks like the same unit test is consistently failing and I'm not sure why. I tried running it locally, but I get unrelated exceptions such as failure to drop tables in use, etc.

I tried recreating the clickhouse container (917f02afdaa9 is the clickhouse docker container):

# Stop the container
docker stop 917f02afdaa9

# Remove the container
docker rm 917f02afdaa9

# Remove the volume
docker volume rm 0782200f2267f1bf332366ebc20593ff989e84b068175673318d51072a9fe4a3

# Start services again
docker compose -f docker-compose.dev.yml up -d

# 1. Create test database
docker exec -it $(docker ps | grep clickhouse | awk '{print $1}') clickhouse-client --query "CREATE DATABASE IF NOT EXISTS posthog_test"

# 2. Run Django migrations first
DEBUG=1 python manage.py migrate

# 3. Run ClickHouse migrations with test database
DEBUG=1 CLICKHOUSE_DATABASE=posthog_test python manage.py migrate_clickhouse --no-input

# 4. Run the test
DEBUG=1 python manage.py test posthog.tasks.test.test_usage_report.UsageReport.test_unlicensed_usage_report -v 3

And when I run the test, I get:

DB::Exception: There was an error on [clickhouse:9000]: Code: 630. DB::Exception: Cannot drop or rename posthog_test.channel_definition (40ffeaa9-0df7-4360-bfec-15a09b5c5b9c), because some tables depend on it: posthog_test.channel_definition_dict. (HAVE_DEPENDENT_OBJECTS) (version 24.8.7.41 (official build)). Stack trace:

So I'm at a loss trying to figure out why this test is failing.