What are the numbers in the log file, and what do they mean?

[ShanghaiTimes]

I'm trying to discover what these numbers mean on each line in the log file?

Can anyone help thanks?

 [2017-02-16 11:03:54] Stratum from pool 0 detected new block
20s: 1.74 avg: 1.85 u: 1.79 Gh/s | A:0 R:0+0(none) HW:6/7.4%
 [2017-02-16 11:04:11] New best share: 116
20s: 1.81 avg: 1.86 u: 1.80 Gh/s | A:0 R:0+0(none) HW:6/6.7%
20s: 1.76 avg: 1.84 u: 1.74 Gh/s | A:0 R:0+0(none) HW:8/8.2%
20s: 1.78 avg: 1.84 u: 1.63 Gh/s | A:0 R:0+0(none) HW:8/8.1%
20s: 1.73 avg: 1.83 u: 1.62 Gh/s | A:0 R:0+0(none) HW:8/7.5%
20s: 1.73 avg: 1.82 u: 1.59 Gh/s | A:0 R:0+0(none) HW:8/7.1%
20s: 1.76 avg: 1.82 u: 1.54 Gh/s | A:0 R:0+0(none) HW:8/6.9%
20s: 1.78 avg: 1.82 u: 1.51 Gh/s | A:0 R:0+0(none) HW:9/7.4%
20s: 1.74 avg: 1.81 u: 1.55 Gh/s | A:0 R:0+0(none) HW:9/6.8%
20s: 1.76 avg: 1.81 u: 1.53 Gh/s | A:0 R:0+0(none) HW:11/7.9%
20s: 1.71 avg: 1.80 u: 1.52 Gh/s | A:0 R:0+0(none) HW:11/7.5%

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[hashnest]

what's this?