Check_MK Werk 6858: Do not log "Legacy perfometer rendered" messages to web.log by default

ID: 6858 Title: Do not log "Legacy perfometer rendered" messages to web.log by default Component: Multisite Level: 1 Class: Bug fix Version: 1.6.0i1 This log message is currently only used for internal cleanups but was logged to the web.log web performing regular GUI actions in the default log level. These messages are now only logged when increasing the "web" log level to informational.