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Aviate Labs

# Replace nodes in subnet 5kdm2

Motivation: 
 - replacing dead node pzv3b-av4if-exyju-qfmed-zbeez-2xlcd-sj22c-zdhus-gnwmo-7cbse-aqe
 - replacing node ugqji-f7rfx-mbubv-44r5n-zfi3k-7ag32-qhkal-xmmyu-5fbot-r6azo-aqe to optimize network topology

Calculated potential impact on subnet decentralization if replacing:

- 1 additional node: (gets better) the average log2 of Nakamoto Coefficients across all features increases from 2.1745 to 2.2575

Based on the calculated potential impact, replacing 1 additional nodes to improve optimization

Note: the heuristic for node replacement relies not only on the Nakamoto coefficient but also on other factors that iteratively optimize network topology.
Due to this, Nakamoto coefficients may not directly increase in every node replacement proposal.
Code for comparing decentralization of two candidate subnet topologies is at:
https://github.com/dfinity/dre/blob/79066127f58c852eaf4adda11610e815a426878c/rs/decentralization/src/nakamoto/mod.rs#L342

Note: the information below is provided for your convenience. Please independently verify the decentralization changes rather than relying solely on this summary.
Here is [an explaination of how decentralization is currently calculated](https://dfinity.github.io/dre/decentralization.html), 
and there are also [instructions for performing what-if analysis](https://dfinity.github.io/dre/subnet-decentralization-whatif.html) if you are wondering if another node would have improved decentralization more.



Decentralization Nakamoto coefficient changes for subnet `5kdm2-62fc6-fwnja-hutkz-ycsnm-4z33i-woh43-4cenu-ev7mi-gii6t-4ae`:
```
    node_provider: 5.00 -> 5.00    (+0%)
      data_center: 5.00 -> 5.00    (+0%)
data_center_owner: 5.00 -> 5.00    (+0%)
             area: 5.00 -> 5.00    (+0%)
          country: 3.00 -> 4.00   (+33%)
```

**Mean Nakamoto comparison:** 4.60 -> 4.80  (+4%)

Overall replacement impact: (gets better) the average log2 of Nakamoto Coefficients across all features increases from 2.1745 to 2.2575

# Details


Nodes removed:
- `pzv3b-av4if-exyju-qfmed-zbeez-2xlcd-sj22c-zdhus-gnwmo-7cbse-aqe` [health: dead, impact on decentralization: (gets worse) the number of different NP actors decreases from 13 to 12]
- `ugqji-f7rfx-mbubv-44r5n-zfi3k-7ag32-qhkal-xmmyu-5fbot-r6azo-aqe` [health: healthy, impact on decentralization: (gets worse) the average log2 of Nakamoto Coefficients across all features decreases from 2.1745 to 1.9170]

Nodes added:
- `ihoip-fmbnl-mm4fa-pu7hu-2sbx2-mzl2f-tgzje-unnjg-bgcac-3apmo-gqe` [health: healthy, impact on decentralization: (gets better) the average log2 of Nakamoto Coefficients across all features increases from 1.9170 to 2.2575]
- `ttjeo-6vece-x2hpb-lzmdg-b2fwl-7osa4-r5vb6-n4dyc-ocg5r-rztx2-eqe` [health: healthy, impact on decentralization: (gets better) the number of different NP actors increases from 12 to 13]


```
    node_provider                                                              data_center            data_center_owner              area                  country        
    -------------                                                              -----------            -----------------              ----                  -------        
    64xe5-tx2s3-4gjmj-pnozr-fejw2-77y5y-rhcjk-glnmx-62brf-qin5q-pqe  1 -> 0    bu1               1    Adam                      1    Barcelona        1    CH            2
    6nbcy-kprg6-ax3db-kh3cz-7jllk-oceyh-jznhs-riguq-fvk6z-6tsds-rqe  0 -> 1    dl1          1 -> 0    Africa Data Centres       1    Bucuresti        1    ES            1
    7k7b7-4pzhf-aivy6-y654t-uqyup-2auiz-ew2cm-4qkl4-nsl4v-bul5k-5qe       1    es1               1    Digital Realty            1    California       1    HK            1
    7ryes-jnj73-bsyu4-lo6h7-lbxk5-x4ien-lylws-5qwzl-hxd5f-xjh3w-mqe       1    fm1               1    Equinix                   1    Gauteng          1    IN            1
    bvcsg-3od6r-jnydw-eysln-aql7w-td5zn-ay5m6-sibd2-jzojt-anwag-mqe       1    ge1               1    Flexential           1 -> 0    Geneva           1    JP            1
    eipr5-izbom-neyqh-s3ec2-52eww-cyfpg-qfomg-3dpwj-4pffh-34xcu-7qe  1 -> 0    hk1               1    Gasan                1 -> 0    HongKong         1    KR            1
    g2ax6-jrkmb-3zuh3-jibtb-q5xoq-njrgo-5utbc-j2o7g-zfq2w-yyhky-dqe       1    jb2               1    HighDC                    1    Ljubljana        1    RO            1
    i7dto-bgkj2-xo5dx-cyrb7-zkk5y-q46eh-gz6iq-qkgyc-w4qte-scgtb-6ae       1    kr1          0 -> 1    Hurricane Electric        1    Panvel           1    SE            1
    nmdd6-rouxw-55leh-wcbkn-kejit-njvje-p4s6e-v64d3-nlbjb-vipul-mae       1    kr2          1 -> 0    KT                   0 -> 1    Seoul            1    SG       0 -> 1
    qsdw4-ao5ye-6rtq4-y3zhm-icjbj-lutd2-sbejz-4ajqz-pcflr-xrhsg-jae       1    lj1               1    M247                      1    Singapore   0 -> 1    SI            1
    r3yjn-kthmg-pfgmb-2fngg-5c7d7-t6kqg-wi37r-j7gy6-iee64-kjdja-jae  0 -> 1    pl2               1    Nine.Ch                   1    Stockholm        1    US       2 -> 1
    sixix-2nyqd-t2k2v-vlsyz-dssko-ls4hl-hyij4-y7mdp-ja6cj-nsmpf-yae       1    sg1          0 -> 1    Posita.si                 1    Texas       1 -> 0    ZA            1
    ucjqj-jmbj3-rs4aq-ekzpw-ltjs3-zrcma-t6r3t-m5wxc-j5yrj-unwoj-mae       1    sh1               1    Telin                0 -> 1    Tokyo            1                   
    wdjjk-blh44-lxm74-ojj43-rvgf4-j5rie-nm6xs-xvnuv-j3ptn-25t4v-6ae       1    ty3               1    Unicom                    1    Zurich           1                   
    zy4m7-z5mhs-zfkpl-zlsjl-blrbx-mvvmq-5z4zu-mf7eq-hhv7o-ezfro-3ae       1    zh4               1    Yotta                     1                                         
```



Forum post link: https://forum.dfinity.org/t/subnet-management-5kdm2-application


Replace nodes in subnet 5kdm2