{[ddoc_cache, hit], [
    {type, counter},
    {desc, <<"number of design doc cache hits">>}
]}.
{[ddoc_cache, miss], [
    {type, counter},
    {desc, <<"number of design doc cache misses">>}
]}.
{[ddoc_cache, recovery], [
    {type, counter},
    {desc, <<"number of design doc cache recoveries">>}
]}.