Restructure for packaging

sample-config/pgmon-metrics.yml

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+metrics:
+  # Discovery metrics
+  discover_dbs:
+    type: set
+    query:
+      0: SELECT datname AS dbname FROM pg_database
+  discover_rep:
+    type: set
+    query:
+      0: SELECT client_addr || '_' || regexp_replace(application_name, '[ ,]', '_', 'g') AS repid, client_addr, state FROM pg_stat_replication
+
+  # cluster-wide metrics
+  version:
+    type: value
+    query:
+      0: SHOW server_version_num
+  max_frozen_age:
+    type: value
+    query:
+      0: SELECT max(age(datfrozenxid)) FROM pg_database
+
+  # Per-database metrics
+  db_stats:
+    type: row
+    query:
+      0: SELECT numbackends, xact_commit, xact_rollback, blks_read, blks_hit, tup_returned, tup_fetched, tup_inserted, tup_updated, tup_deleted, conflicts, temp_files, temp_bytes, deadlocks, blk_read_time, blk_write_time, extract('epoch' from stats_reset)::float FROM pg_stat_database WHERE datname = %(dbname)s
+      140000: SELECT numbackends, xact_commit, xact_rollback, blks_read, blks_hit, tup_returned, tup_fetched, tup_inserted, tup_updated, tup_deleted, conflicts, temp_files, temp_bytes, deadlocks, COALESCE(checksum_failures, 0) AS checksum_failures, blk_read_time, blk_write_time, session_time, active_time, idle_in_transaction_time, sessions, sessions_abandoned, sessions_fatal, sessions_killed, extract('epoch' from stats_reset)::float FROM pg_stat_database WHERE datname = %(dbname)s
+
+  # Debugging
+  ntables:
+    type: value
+    query:
+      0: SELECT count(*) AS ntables FROM pg_stat_user_tables
+
+  # Per-replication metrics
+  rep_stats:
+    type: row
+    query:
+      0: SELECT * FROM pg_stat_database WHERE client_addr || '_' || regexp_replace(application_name, '[ ,]', '_', 'g') = '{repid}'
+
+  # Debugging
+  sleep:
+    type: value
+    query:
+      0: SELECT now(), pg_sleep(5);

sample-config/pgmon.yml

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+# Min PostgreSQL connection pool size (per database)
+#min_pool_size: 0
+
+# Max PostgreSQL connection pool size (per database)
+#max_pool_size: 4
+
+# How long a connection can sit idle in the pool before it's removed (seconds)
+#max_idle_time: 30
+
+# Log level for stderr logging (see https://docs.python.org/3/library/logging.html#logging-levels)
+# Possible values are: debug, info, warning, error, critical
+#log_level: 'error'
+
+# Database user to connect as
+#dbuser: 'postgres'
+
+# Database host
+#dbhost: '/var/run/postgresql'
+
+# Database port
+#dbport: 5432
+
+# Default database to connect to when none is specified for a metric
+#dbname: 'postgres'
+
+# Timeout for getting a connection slot from a pool
+#pool_slot_timeout: 5
+
+# PostgreSQL connection timeout (seconds)
+# Note: It can actually be double this because of retries
+#connect_timeout: 5
+
+# Time to wait before trying to reconnect again after a reconnect failure (seconds)
+#reconnect_cooldown: 30
+
+# How often to check the version of PostgreSQL (seconds)
+#version_check_period: 300
+
+# Metrics
+#metrics: {}
+
+include:
+  - pgmon-metrics.yml