Use JSONB for Telegraf fields/tags to avoid 1600-column limit

High-cardinality inputs (docker, procstat, kafka) trigger ALTER TABLE
ADD COLUMN on every new field name, and with all minions writing into
a shared 'telegraf' schema the metric tables hit Postgres's 1600-column
per-table ceiling quickly. Setting fields_as_jsonb and tags_as_jsonb on
the postgresql output keeps metric tables fixed at (time, tag_id,
fields jsonb) and tag tables at (tag_id, tags jsonb).

- so-stats-show rewritten to use JSONB accessors
  ((fields->>'x')::numeric, tags->>'host', etc.) and cast memory/disk
  sizes to bigint so pg_size_pretty works
- Drop regex/regexFailureMessage from telegraf_output SOC UI entry to
  match the convention upstream used when removing them from
  mdengine/pcapengine/pipeline; options: list drives validation

salt/telegraf/etc/telegraf.conf

@@ -98,10 +98,15 @@
 # options='-c role=so_telegraf' makes every connection SET ROLE to the shared
 # group role so tables created on first write are owned by so_telegraf, and
 # all per-minion members can INSERT/SELECT them via role inheritance.
+# fields_as_jsonb/tags_as_jsonb keep metric tables at a fixed column count so
+# high-cardinality inputs (docker, procstat, kafka) don't blow past the
+# Postgres 1600-column-per-table limit.
 [[outputs.postgresql]]
   connection = "host={{ PG_HOST }} port=5432 user={{ PG_USER }} password={{ PG_PASS }} dbname=so_telegraf sslmode=verify-full sslrootcert=/etc/telegraf/ca.crt options='-c role=so_telegraf'"
   schema = "telegraf"
   tags_as_foreign_keys = true
+  tags_as_jsonb = true
+  fields_as_jsonb = true
 {%- endif %}
 
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