Handle a log entry.
Parameters
$timestampintrequired- Log timestamp.
$levelstringrequiredemergency|alert|critical|error|warning|notice|info|debug.$messagestringrequired- Log message.
$contextarrayrequired- Additional information for log handlers.
sourcestringOptional. Determines log file to write to. Default'log'._legacyboolOptional. Default false. True to use outdated log format originally used in deprecated EVF_Logger::add calls.