Invalidate database on failed login #372
Merged
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When the exporter fails to connect to the database with an ORA-01017 error (unauthorized, login failed), that database is invalidated, and the exporter will no longer attempt to scrape that database. A warning message is logged, identifying the invalid database configuration that must be fixed or removed.
The database is invalidated to prevent unnecessary connection attempts that are assumed to fail - which may lock out users or cause other unintended, unwanted consequences.