More info in mmap error message (#8058)
More info in mmap error message (#8058)

Signed-off-by: Ganesh Vernekar <cb5593e95c6f4f9d31a7d363cec8452e89af4967@iith.ac.in>
prometheus/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,alileza/prometheus,alileza/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,alileza/prometheus,prometheus/prometheus,keegancsmith/prometheus,prometheus/prometheus,keegancsmith/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,GoogleCloudPlatform/prometheus,GoogleCloudPlatform/prometheus