Previously, auxiliary processes and background workers not connected to a database (such as the logical replication launcher) weren't shown. Include them, so that we can see the associated wait state information. Add a new column to identify the processes type, so that people can filter them out easily using SQL if they wish.
Before this patch was written, there was discussion about whether we should expose this information in a separate view, so as to avoid contaminating pg_stat_activity with things people might not want to see. But putting everything in pg_stat_activity was a more popular choice, so that's what the patch does.
Kuntal Ghosh, reviewed by Amit Langote and Michael Paquier. Some revisions and bug fixes by me.
fc70a4b Show more processes in pg_stat_activity.
doc/src/sgml/monitoring.sgml | 15 ++-
src/backend/bootstrap/bootstrap.c | 4 +
src/backend/catalog/system_views.sql | 3 +-
src/backend/postmaster/pgstat.c | 194 ++++++++++++++++++++++++++++++-----
src/backend/postmaster/startup.c | 1 +
src/backend/replication/walsender.c | 4 +-
src/backend/storage/lmgr/proc.c | 27 +++++
src/backend/utils/adt/pgstatfuncs.c | 60 ++++++++---
src/backend/utils/init/postinit.c | 8 ++
src/include/catalog/catversion.h | 2 +-
src/include/catalog/pg_proc.h | 2 +-
src/include/pgstat.h | 26 +++++
src/include/storage/proc.h | 3 +-
src/test/regress/expected/rules.out | 9 +-
14 files changed, 305 insertions(+), 53 deletions(-)