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John Wiegley

# Replace nodes in subnet cv73p

Motivation: 
 - replacing node m2yt5-mn7lw-76bqj-ijlgn-55n3k-xbjzl-43olv-6xi4p-2ecp4-eipxu-xae to optimize network topology
 - replacing node jsaui-j3qrn-3i3m3-xdn2s-bad3f-5kwlu-36gej-i75ik-5fjrg-z3jge-bqe to optimize network topology

Calculated potential impact on subnet decentralization if replacing:

- 1 additional node would result in: (gets better) the number of nodes controlled by dominant Country actors decreases from 6 to 5 (solution penalty: 10)
- 2 additional nodes would result in: (gets better) the average log2 of Nakamoto Coefficients across all features increases from 2.0575 to 2.1745

Based on the calculated potential impact, replacing 2 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 `cv73p-6v7zi-u67oy-7jc3h-qspsz-g5lrj-4fn7k-xrax3-thek2-sl46v-jae`:
```
    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: 2.00 -> 3.00   (+50%)
```

**Mean Nakamoto comparison:** 4.40 -> 4.60  (+5%)

Overall replacement impact: (gets better) the average log2 of Nakamoto Coefficients across all features increases from 2.0575 to 2.1745

Impact on business rules penalties: 20 -> 0


# Details

Nodes removed:
- `m2yt5-mn7lw-76bqj-ijlgn-55n3k-xbjzl-43olv-6xi4p-2ecp4-eipxu-xae` [health: healthy]
- `jsaui-j3qrn-3i3m3-xdn2s-bad3f-5kwlu-36gej-i75ik-5fjrg-z3jge-bqe` [health: healthy]

Nodes added:
- `2mmpk-6kvr3-3syvq-twao3-g3fxc-gz3n2-o3tgf-34irb-idruv-cogfq-sqe` [health: healthy]
- `ax6zb-r4jnm-5aswz-ahoqx-ujs2a-mcvds-6gmdt-4ggxg-tkwdr-3323l-vqe` [health: healthy]


```
    node_provider                                                              data_center            data_center_owner             area                        country        
    -------------                                                              -----------            -----------------             ----                        -------        
    4r6qy-tljxg-slziw-zoteo-pboxh-vlctz-hkv2d-7zior-u3pxm-mmuxb-cae  0 -> 1    aw1               1    Anonstake                1    Brussels Capital       1    BE            1
    6nbcy-kprg6-ax3db-kh3cz-7jllk-oceyh-jznhs-riguq-fvk6z-6tsds-rqe       1    br1               1    Baltneta            0 -> 1    Bucuresti              1    CH            2
    7a4u2-gevsy-5c5fs-hsgri-n2kdz-dxxwf-btcfp-jykro-l4y7c-7xky2-aqe       1    bt1          0 -> 1    Datasite                 1    California        1 -> 0    ES       0 -> 1
    7ryes-jnj73-bsyu4-lo6h7-lbxk5-x4ien-lylws-5qwzl-hxd5f-xjh3w-mqe       1    bu1               1    Digital Realty           1    Florida                1    HK            1
    bvcsg-3od6r-jnydw-eysln-aql7w-td5zn-ay5m6-sibd2-jzojt-anwag-mqe       1    fm1          1 -> 0    Equinix                  1    Geneva                 1    JP            1
    eipr5-izbom-neyqh-s3ec2-52eww-cyfpg-qfomg-3dpwj-4pffh-34xcu-7qe  1 -> 0    ge2               1    Everyware                1    HongKong               1    LT       0 -> 1
    g2ax6-jrkmb-3zuh3-jibtb-q5xoq-njrgo-5utbc-j2o7g-zfq2w-yyhky-dqe       1    hk1               1    Flexential          1 -> 0    Ljubljana              1    RO            1
    i7dto-bgkj2-xo5dx-cyrb7-zkk5y-q46eh-gz6iq-qkgyc-w4qte-scgtb-6ae       1    lj2               1    Hurricane Electric  1 -> 0    Madrid            0 -> 1    SG            1
    ivf2y-crxj4-y6ewo-un35q-a7pum-wqmbw-pkepy-d6uew-bfmff-g5yxe-eae  0 -> 1    ma3          0 -> 1    IPCore              0 -> 1    Maribor                1    SI            2
    kos24-5xact-6aror-uofg2-tnvt6-dq3bk-c2c5z-jtptt-jbqvc-lmegy-qae       1    mb1               1    M247                     1    Oregon            1 -> 0    US       4 -> 2
    n32q7-33lmk-m33tr-o5ltb-po6cb-tqqrr-2x6wp-pzhw7-ymizu-o3fyp-sqe  1 -> 0    or1               1    Posita.si                1    Pennsylvania           1                   
    rbn2y-6vfsb-gv35j-4cyvy-pzbdu-e5aum-jzjg6-5b4n5-vuguf-ycubq-zae       1    pl1          1 -> 0    SafeHost                 1    Singapore              1                   
    sixix-2nyqd-t2k2v-vlsyz-dssko-ls4hl-hyij4-y7mdp-ja6cj-nsmpf-yae       1    sg1               1    Telin                    1    Tokyo                  1                   
    wdjjk-blh44-lxm74-ojj43-rvgf4-j5rie-nm6xs-xvnuv-j3ptn-25t4v-6ae       1    ty1               1    Tierpoint                1    Vilnius           0 -> 1                   
    wwdbq-xuqhf-eydzu-oyl7p-ga565-zm7s7-yrive-ozgsy-zzgh3-qwb3j-cae       1    zh2               1    Unicom                   1    Zurich                 1                   
```

Business rules check results *before* the membership change:
- Country US controls 4 of nodes, which is higher than target of 2 for the subnet. Applying penalty of 20.


Forum post link: https://forum.dfinity.org/t/subnet-management-cv73p-application


Replace nodes in subnet cv73p