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Merge #12569: net: Increase signal-to-noise ratio in debug.log by adjusting log…

Authored by jasonbcox on Aug 7 2019, 21:17.

Description

Merge #12569: net: Increase signal-to-noise ratio in debug.log by adjusting log level when logging failed non-manual connect():s

Summary:
cba2800 Increase signal-to-noise ratio in debug.log by adjusting log level when logging failed non-manual connect():s (practicalswift)

Pull request description:

Increase signal-to-noise ratio in `debug.log` by adjusting log level when logging failed non-manual `connect()`:s.

Before this patch:

```
$ src/bitcoind -printtoconsole
…
2018-02-28 18:42:51 UpdateTip: new best=0000000000005448b10a219683d34b770a28044e1cc421032dea1a79ff548948 height=1286903 version=0x20000000 log2_work=69.791313 tx=17408546 date='2018-02-28 18:42:46' progress=1.000000 cache=0.0MiB(173txo)
2018-02-28 18:37:52 connect() 10.11.21.34:18333 failed after select(): Connection refused (111)
2018-02-28 18:43:22 connect() to 10.11.43.14:18333 failed after select(): Network is unreachable (101)
2018-02-28 18:44:49 UpdateTip: new best=000000000000029a521ff2803e1441b09413b876accff5084a4cccf7747d798b height=1286904 version=0x20000000 log2_work=69.791345 tx=17408559 date='2018-02-28 18:44:51' progress=1.000000 cache=0.1MiB(502txo)
2018-02-28 18:46:54 connect() to [2001:0:9d38:78ff:1234:1234:1234:1234]:18333 failed: Network is unreachable (101)
2018-02-28 18:48:56 connect() to [2001:0:9d38:6aff:1234:1234:1234:1234]:18333 failed: Network is unreachable (101)
2018-02-28 18:49:11 UpdateTip: new best=000000000000000206b79eb235e5dd907b6369de0e5d764330bf40ec0d460311 height=1286905 version=0x20000000 log2_work=69.791377 tx=17408577 date='2018-02-28 18:49:12' progress=1.000000 cache=1.0MiB(5245txo)
```

After this patch:

```
$ src/bitcoind -printtoconsole
…
2018-02-28 18:42:51 UpdateTip: new best=0000000000005448b10a219683d34b770a28044e1cc421032dea1a79ff548948 height=1286903 version=0x20000000 log2_work=69.791313 tx=17408546 date='2018-02-28 18:42:46' progress=1.000000 cache=0.0MiB(173txo)
2018-02-28 18:44:49 UpdateTip: new best=000000000000029a521ff2803e1441b09413b876accff5084a4cccf7747d798b height=1286904 version=0x20000000 log2_work=69.791345 tx=17408559 date='2018-02-28 18:44:51' progress=1.000000 cache=0.1MiB(502txo)
2018-02-28 18:49:11 UpdateTip: new best=000000000000000206b79eb235e5dd907b6369de0e5d764330bf40ec0d460311 height=1286905 version=0x20000000 log2_work=69.791377 tx=17408577 date='2018-02-28 18:49:12' progress=1.000000 cache=1.0MiB(5245txo)
```

Please note that "manual `connect()`:s" (invoked via `-connect`, `-proxy` or `addnode`) are still reported at the default log level as these messages are likely to be relevant to end-users:

```
$ src/bitcoind -printtoconsole -connect=127.0.0.1:1234
…
2018-02-28 18:31:13 connect() to 127.0.0.1:1234 failed after select(): Connection refused (111)

$ src/bitcoind -printtoconsole -proxy=127.0.0.1:1234
…
2018-02-28 18:32:32 connect() to 127.0.0.1:1234 failed after select(): Connection refused (111)

$ src/bitcoind -printtoconsole &
$ src/bitcoin-cli addnode 127.0.0.1:1234 onetry
…
2018-02-28 18:33:40 connect() to 127.0.0.1:1234 failed after select(): Connection refused (111)
```

Tree-SHA512: 92e3c1e4b54ce8ccdd7ec31de147c8505710cd799ceb2bbc8576a086709967802403c9184df364b3cfa59bd98859f6ac8feb27fb09b9324194c6c47a042fc6d3

Backport of Core PR12569

https://github.com/bitcoin/bitcoin/pull/12569/files

Test Plan:
make check
And see summary for checking reduced log noise.

Reviewers: #bitcoin_abc, deadalnix, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D3822

Details