Add tip bot balance to metrics

[rzadp]

• Add the balance to the metrics - progresses Implement Metrics & Healthchecks + Grafana #20
• Fetch balance for all networks on startup, and update it after tip requests
• Some necessary refactors around chain config - tipUrl is no longer part of ChainConfig, because it depends on a given tip instance

[mordamax]

afaiu this will be running on prod?
therefore 2 dumb questions

1. do we need on prod to update local* networks?
2. is the tipBotAddress same for each network?

i guess on prod we will see local* networks failed to check balance

i wonder why we need to update All if we run one instance per its address/network and thus they will run updateBalance for itself?

[shawntabrizi]

The answer to (2) should be yes.

[rzadp]

do we need on prod to update local* networks?
i guess on prod we will see local* networks failed to check balance

We don't need local*, my idea was to not do anything special for those and just let it fail once to check balance.
But maybe I better change it so we don't have errors every time the app is restarted.

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is the tipBotAddress same for each network?
The answer to (2) should be yes.

I believe it is a yes.

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if we run one instance per its address/network

My understanding is that we run one instance per all networks (so Polkadot and Kusama in our case), using a single instance and a single seed for accounts on both those networks. So I wanted to update all of those networks on startup.

[mordamax]

ah right, if we run all at once for api now, and one address, so then looks like we just need to remove local.* ones 👌

[rzadp]

@mordamax Done.