Rename logtag for clarity.

# time: cpu time millis (not wall time), including lock acquisition

# blocking_package: if this is on a main thread, the package name, otherwise ""

# sample_percent: the percent likelihood this query was logged

52000 db_operation (db|3),(sql|3),(time|1|3),(blocking_package|3),(sample_percent|1|6)

52000 db_sample (db|3),(sql|3),(time|1|3),(blocking_package|3),(sample_percent|1|6)

# http request/response stats

52001 http_stats (useragent|3),(response|2|3),(processing|2|3),(tx|1|2),(rx|1|2)