Document runtime-config on https://cortexmetrics.io/docs/configuration/configuration-file/

[alanprot]

The format of the runtime config is not documented anywhere on https://cortexmetrics.io/docs/configuration/configuration-file/

Even the per tenant limits (under overrides key) is not documented.

See: https://github.com/cortexproject/cortex/blob/74d33df75ecd4a138191f1a75ddd6f806f2c18b0/pkg/cortex/runtime_config.go#L24-L32

Some of the fields mention that it can be overridden but it's not clear how. Ex:

# The default tenant's shard size when the shuffle-sharding strategy is used.
# Must be set both on ingesters and distributors. When this setting is specified
# in the per-tenant overrides, a value of 0 disables shuffle sharding for the
# tenant.
# CLI flag: -distributor.ingestion-tenant-shard-size
[ingestion_tenant_shard_size: <int> | default = 0]

Ans some other fields we dont even have that reference. Ex: we can override by tenant the sse config but is not mentioned anywhere.

[Nitesh639]

Hello @alanprot, I would like to work on this issue.

[alanprot]

Hi @Nitesh639! yeah.. please do.

Let me know if u need any guidance with it.

[Nitesh639]

@jeromeinsf Thank you for appointing me. I will try to resolve this issue asap. I have stuck to the college circular, so anyone who wants to work on this issue may go ahead.

[ankur12-1610]

Hey @Nitesh639 I can help you with that :)

[Nitesh639]

Yes @ankur12-1610

[ankur12-1610]

@alanprot I'm working on on then :)

[friedrichg]

Related https://github.com/cortexproject/cortex/issues/3078

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