very high ram usage by OSDs on Nautilus

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Ok looking at mempool, what does it tell me? This affects multiple OSDs, got crashes almost every hour.

{
    "mempool": {
        "by_pool": {
            "bloom_filter": {
                "items": 0,
                "bytes": 0
            },
            "bluestore_alloc": {
                "items": 2545349,
                "bytes": 20362792
            },
            "bluestore_cache_data": {
                "items": 28759,
                "bytes": 6972870656
            },
            "bluestore_cache_onode": {
                "items": 2885255,
                "bytes": 1892727280
            },
            "bluestore_cache_other": {
                "items": 202831651,
                "bytes": 5403585971
            },
            "bluestore_fsck": {
                "items": 0,
                "bytes": 0
            },
            "bluestore_txc": {
                "items": 21,
                "bytes": 15792
            },
            "bluestore_writing_deferred": {
                "items": 77,
                "bytes": 7803168
            },
            "bluestore_writing": {
                "items": 4,
                "bytes": 5319827
            },
            "bluefs": {
                "items": 5242,
                "bytes": 175096
            },
            "buffer_anon": {
                "items": 726644,
                "bytes": 193214370
            },
            "buffer_meta": {
                "items": 754360,
                "bytes": 66383680
            },
            "osd": {
                "items": 29,
                "bytes": 377464
            },
            "osd_mapbl": {
                "items": 50,
                "bytes": 3492082
            },
            "osd_pglog": {
                "items": 99011,
                "bytes": 46170592
            },
            "osdmap": {
                "items": 48130,
                "bytes": 1151208
            },
            "osdmap_mapping": {
                "items": 0,
                "bytes": 0
            },
            "pgmap": {
                "items": 0,
                "bytes": 0
            },
            "mds_co": {
                "items": 0,
                "bytes": 0
            },
            "unittest_1": {
                "items": 0,
                "bytes": 0
            },
            "unittest_2": {
                "items": 0,
                "bytes": 0
            }
        },
        "total": {
            "items": 209924582,
            "bytes": 14613649978
        }
    }
}


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