build: make it run again#3
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add example address config
Nethermind 1.37.x has a worldstate-reentrance race that surfaces under concurrent eth_call load (fixed upstream in nethermind#11548, not yet released as of v1.37.2). When BalanceOf returns (nil, err) the previous code passed nil to ToDecimals, which crashed on big.Int.String() with SIGSEGV, killing the exporter on the first transient error. - GetTokenBalance: check both error returns, retry once with a 150ms backoff, return "0" on persistent failure. - ToDecimals: defensive nil guard so a regression never re-introduces the crash. With this patch the exporter survives sporadic RPC errors and the balance metric stays well-formed. A handful of nodes per cycle may report 0 transiently but the next cycle should recover them.
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