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[proxysql] Generate metric for all pairs of hostgroup/status (backend) #19438

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[proxysql] Generate metric for all pairs of hostgroup/status (backend) #19438

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18 changes: 17 additions & 1 deletion proxysql/datadog_checks/proxysql/queries.py
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Original file line number Diff line number Diff line change
Expand Up @@ -236,7 +236,23 @@

STATS_MYSQL_BACKENDS = {
'name': 'stats_mysql_backends',
'query': 'SELECT hostgroup, status, COUNT(*) FROM stats_mysql_connection_pool GROUP BY hostgroup, status',
# Note: this query seems a bit complex, but it's basically:
# SELECT hostgroup, status, COUNT(*) FROM stats_mysql_connection_pool GROUP BY hostgroup, status
# The complexity (JOIN, subquery) is only here to always generate a metric (at 0) for all combinations of
# status&hostgroup, even when no server exists at the moment in that status & hostgroup.
'query': """
SELECT refpairs.hostgroup, refpairs.status, count(stats.srv_host) as count
FROM (
SELECT DISTINCT(hostgroup), refstatuses.status
FROM stats_mysql_connection_pool
JOIN (
select 'ONLINE' as status union all select 'SHUNNED' as status union all
select 'OFFLINE_SOFT' as status union all select 'OFFLINE_HARD' as status
) refstatuses
) refpairs
LEFT JOIN stats_mysql_connection_pool stats ON stats.hostgroup=refpairs.hostgroup and stats.status=refpairs.status
GROUP BY refpairs.hostgroup, refpairs.status;
""",
'columns': [
{'name': 'hostgroup', 'type': 'tag'},
{'name': 'status', 'type': 'tag'},
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