[Internal] Request Hedging: Refactors HedgeRegion diagnostics field to only show successful region

[NaluTripician]

Pull Request Template

Description

Refactors Hedge Context. Hedge Context will show what regions the SDK reaches out to.

We are also replacing Hedge Regions with Response Region, showing what region the response is coming from.

Type of change

Please delete options that are not relevant.

• [] New feature (non-breaking change which adds functionality)

Diagnostics Pre Change

{
    "Summary": {
        "DirectCalls": {
            "(200, 0)": 2
        },
        "GatewayCalls": {
            "(200, 0)": 4,
            "(304, 0)": 1
        }
    },
    "name": "ReadItemAsync",
    "start datetime": "2024-08-02T19:17:15.724Z",
    "duration in milliseconds": 1150.7291,
    "data": {
        "Client Configuration": {
            "Client Created Time Utc": "2024-08-02T19:17:15.7212891Z",
            "MachineId": "hashedMachineName:b06bba98-6c97-3610-9de4-1b586eee7a34",
            "NumberOfClientsCreated": 2,
            "NumberOfActiveClients": 2,
            "ConnectionMode": "Direct",
            "User Agent": "cosmos-netstandard-sdk/3.42.0|2|X64|Microsoft Windows 10.0.22631|.NET 6.0.32|L|",
            "ConnectionConfig": {
                "gw": "(cps:50, urto:6, p:False, httpf: False)",
                "rntbd": "(cto: 5, icto: -1, mrpc: 30, mcpe: 65535, erd: True, pr: ReuseUnicastPort)",
                "other": "(ed:False, be:False)"
            },
            "ConsistencyConfig": "(consistency: NotSet, prgns:[Central US, North Central US], apprgn: )",
            "ProcessorCount": 12
        },
        "Hedge Regions": "(North Central US, https://dotnet-v3-multiregion-northcentralus.documents.azure.com/), (Central US, https://dotnet-v3-multiregion-centralus.documents.azure.com/)",
        "Hedge Context": "Hedged Request"
    }
 }

Diagnostics Post Change

{
    "Summary": {
        "DirectCalls": {
            "(200, 0)": 2
        },
        "GatewayCalls": {
            "(200, 0)": 4,
            "(304, 0)": 1
        }
    },
    "name": "ReadItemAsync",
    "start datetime": "2024-08-07T17:49:59.591Z",
    "duration in milliseconds": 1209.7946,
    "data": {
        "Client Configuration": {
            "Client Created Time Utc": "2024-08-07T17:49:59.5902882Z",
            "MachineId": "hashedMachineName:b06bba98-6c97-3610-9de4-1b586eee7a34",
            "NumberOfClientsCreated": 2,
            "NumberOfActiveClients": 2,
            "ConnectionMode": "Direct",
            "User Agent": "cosmos-netstandard-sdk/3.42.0|2|X64|Microsoft Windows 10.0.22631|.NET 6.0.32|L|",
            "ConnectionConfig": {
                "gw": "(cps:50, urto:6, p:False, httpf: False)",
                "rntbd": "(cto: 5, icto: -1, mrpc: 30, mcpe: 65535, erd: True, pr: ReuseUnicastPort)",
                "other": "(ed:False, be:False)"
            },
            "ConsistencyConfig": "(consistency: NotSet, prgns:[Central US, North Central US], apprgn: )",
            "ProcessorCount": 12
        },
        "Hedge Context": "Central US, North Central US",
        "Response Region": "North Central US"
    }
}

[kirankumarkolli]

In Description: Exclude region is showing only after update

[kirankumarkolli]

    "Hedge Context": "[Central US, Hedged Request Sent],[North Central US, Hedged Request Successful]",

    "Response Region": "North Central US"

Thinking loud: "Response Region" already covers which Task completed first.
In "Hedged Context" per region state is Task status so are they redundant?

Update from offline:

• Hedged Context will only carry the regions

[NaluTripician]

In Description: Exclude region is showing only after update

Logs were from before remove exclude regions PR was merged. Updated to reflect current state.