Promtail logentry_dropped_lines_total metric not incrementing

[lukeplausin]

Describe the bug
According to the docs, promtail should increment this counter when drop statements are matched.

https://grafana.com/docs/loki/latest/clients/promtail/stages/drop/

The documentation mentions a metric called "logentry_drop_lines_total", I can't see it in my prometheus deployment but there is one called logentry_dropped_lines_total. It has the correct labels set by the drop_counter_reason setting, but all of the counts are null.

To Reproduce
Steps to reproduce the behavior:

1. Deploy promtail with servicemonitor and prometheus
2. Deploy a pipeline with a drop statement
3. Check the promtail metrics

Expected behavior

• The logentry_dropped_lines_total metric should increment based on how many lines have been dropped by the pipeline
• The documentation should have the correct metric name

Promtail v.2.3.0

[owen-d]

oops!