apache exporter failing on donate-01, relay-01, and weather-01

we should also make sure to alert on that metric:

# HELP apache_exporter_scrape_failures_total Number of errors while scraping apache.
# TYPE apache_exporter_scrape_failures_total counter
apache_exporter_scrape_failures_total 9745

... and then... well, fix the damn alert. 😄

looking at prometheus, the query (increase(apache_exporter_scrape_failures_total[5m]) > 0) yields 3 results: donate-01, relay-01 and weather-01, i've updated the title to match that.