From 4477dfa9b3694d8305ff8fe048ad4668d2ba145b Mon Sep 17 00:00:00 2001
From: Will Rouesnel <w.rouesnel@gmail.com>
Date: Tue, 6 Jun 2017 22:47:52 +1000
Subject: [PATCH] Add warning if Postgres Version is lower then the minimum
 version.

---
 postgres_exporter.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/postgres_exporter.go b/postgres_exporter.go
index 9d745706..0ff18072 100644
--- a/postgres_exporter.go
+++ b/postgres_exporter.go
@@ -881,6 +881,9 @@ func (e *Exporter) checkMapVersions(ch chan<- prometheus.Metric, db *sql.DB) err
 		return errors.New(fmt.Sprintln("Error scanning version string:", err))
 	}
 	semanticVersion, err := parseVersion(versionString)
+	if semanticVersion.LT(lowestSupportedVersion) {
+		log.Warnln("PostgreSQL version is lower then our lowest supported version! Got", semanticVersion.String(), "minimum supported is", lowestSupportedVersion.String())
+	}
 
 	// Check if semantic version changed and recalculate maps if needed.
 	if semanticVersion.NE(e.lastMapVersion) || e.metricMap == nil {