Cherry-pick #2509 and #2550 to 1.x LTS

[eddyashton]

#2509
#2550

Main feature is #2550, but this actually depends on #2509, so that's cherry-picked too.

Noticed this old PR still had the 1.x-todo label. There was ongoing discussion about how this should be exposed to JS, so for now it is only a C++ API.

TODO:

• Add CHANGELOG entry.

[ghost]

1.x-cherry-2550@31353 aka 20210825.16 vs release/1.x ewma over 20 builds from 29819 to 31304

Click to see table

build_id	build_number	sb_sgx_cft^	sb_sgx_cft_mem	sb_sgx_bft^	sb_sgx_bft_mem	sb_ws_sgx_cft^	sb_ws_sgx_cft_mem	sb_sig_sgx_cft^	sb_sig_sgx_cft_mem	tpcc_sgx_cft^	tpcc_sgx_cft_mem	tpcc_sgx_bft^	tpcc_sgx_bft_mem	ls_sgx_cft^	ls_sgx_cft_mem	ls_ws_sgx_cft^	ls_ws_sgx_cft_mem	ls_jwt_sgx_cft^	ls_jwt_sgx_cft_mem	ls_js_sgx_cft^	ls_js_sgx_cft_mem	ls_js_jwt_sgx_cft^	ls_js_jwt_sgx_cft_mem	CHAMP put (/s)^	CHAMP get (/s)^
29819	20210727.1	29053.4	1.4291e+07	14002.7	3.86704e+07	33640.6	1.35046e+07	5539.66	1.03588e+07	6592.44	9.13613e+07	3401.42	1.58994e+08	21123.8	1.71746e+07	30289.9	1.76989e+07	4128.82	1.50774e+07	1928.25	1.0621e+07	1405.22	7.73741e+06	1.33047e+06	3.66369e+07
29851	20210728.1	27132.2	1.27181e+07	14634.3	3.84083e+07	33874.8	1.35046e+07	5044.65	1.0621e+07	6623.11	9.13613e+07	3369.37	1.84947e+08	24317.6	1.76989e+07	30151.1	1.7961e+07	4444.59	1.50774e+07	2037.81	1.11453e+07	1458.51	8.2617e+06	1.3383e+06	3.54325e+07
29881	20210729.1	26517.1	1.29803e+07	14845.2	3.94568e+07	33596.5	1.32424e+07	4853.78	1.03588e+07	6705.74	9.24099e+07	3395.63	1.57946e+08	24323.2	1.74367e+07	29896.2	1.82232e+07	4226.82	1.50774e+07	2017.68	8.78598e+06	1470.7	8.2617e+06	1.33507e+06	3.62478e+07
29903	20210730.1	29466.8	1.27181e+07	13798.5	3.73597e+07	33833.5	1.35046e+07	4979.12	1.0621e+07	6683.03	9.13613e+07	3419.87	1.65286e+08	23893.6	1.7961e+07	27790	1.76989e+07	4207.79	1.45532e+07	1993.25	8.2617e+06	1476.94	8.2617e+06	1.34436e+06	3.5993e+07
29929	20210802.1	24718.2	1.29803e+07	14346.9	3.86704e+07	34228.3	1.35046e+07	5018.9	1.03588e+07	6764.09	9.29342e+07	3285.44	1.91762e+08	23247.7	1.76989e+07	28009.4	1.74367e+07	4491.75	1.48153e+07	2099.05	8.52384e+06	1479.14	8.2617e+06	1.34383e+06	3.62478e+07
30026	20210803.1	28798	1.29803e+07	14324	3.99811e+07	34402.1	1.32424e+07	5410.96	1.08831e+07	6775.81	9.05749e+07	3436.21	1.5113e+08	23760.6	1.74367e+07	28662.6	1.76989e+07	4232.37	1.48153e+07	2060.01	8.52384e+06	1481.42	7.99955e+06	1.35369e+06	3.55556e+07
30122	20210804.1	28872.2	1.32424e+07	14098.5	3.91947e+07	34544.5	1.32424e+07	5477.97	1.0621e+07	6366.3	9.24099e+07	3330.27	1.79704e+08	23920.9	1.74367e+07	30739.7	1.82232e+07	4591.41	1.45532e+07	2089.96	8.52384e+06	1485.67	7.99955e+06	1.33944e+06	3.67684e+07
30304	20210805.1	27532.2	1.29803e+07	13634	3.76218e+07	34343	1.35046e+07	4900.76	1.03588e+07	6712.06	9.18856e+07	3327.4	1.915e+08	23859.1	1.71746e+07	28424.9	1.74367e+07	4529.77	1.48153e+07	2059.6	8.78598e+06	1500.11	7.99955e+06	1.35971e+06	3.61837e+07
30605	20210810.1	30082.3	1.16696e+07	16026.4	3.73597e+07	35464.3	1.19317e+07	5126.67	1.11453e+07	6600.01	9.18856e+07	1574.67	1.48247e+08	25713.9	1.69124e+07	31330.7	1.71746e+07	4430.55	1.53396e+07	2086.6	8.2617e+06	1530.01	7.99955e+06	1.43017e+06	3.58042e+07
30674	20210811.1	28544.7	1.16696e+07	15619.1	3.6049e+07	35885	1.19317e+07	5143.49	1.0621e+07	6643.99	9.03128e+07	1445.86	1.63451e+08	25474.7	1.66503e+07	30447.9	1.71746e+07	4427.33	1.4291e+07	2112.13	8.2617e+06	1522.17	7.99955e+06	1.42082e+06	3.63766e+07
30750	20210812.1	29578.7	1.16696e+07	14506.3	3.68354e+07	35426.2	1.21939e+07	5616.81	1.08831e+07	6698.23	9.13613e+07	1379.82	1.50082e+08	25525.8	1.66503e+07	31232.1	1.71746e+07	4460.03	1.53396e+07	2095.3	8.2617e+06	1524.47	7.99955e+06	1.43296e+06	3.50685e+07
30818	20210813.1	30084.4	1.16696e+07	15416.7	3.68354e+07	34811.4	1.16696e+07	5195.25	1.08831e+07	6236.26	9.08371e+07	1850.91	1.35664e+08	25406.1	1.66503e+07	31620.8	1.71746e+07	4437.01	1.53396e+07	2093.71	8.2617e+06	1529	7.99955e+06	1.43055e+06	3.59292e+07
30875	20210816.1	29623.9	1.16696e+07	15700.7	3.65732e+07	30152.1	1.16696e+07	5628.21	1.08831e+07	6428.26	9.26721e+07	1556.78	1.50082e+08	25311.6	1.69124e+07	31542	1.71746e+07	4365.3	1.53396e+07	2096.57	1.11453e+07	1513.25	7.99955e+06	1.42667e+06	3.58663e+07
30919	20210817.1	29564.7	1.16696e+07	16023.6	3.70975e+07	35692.2	1.19317e+07	5115.32	1.0621e+07	6649.86	9.29342e+07	1598.95	1.38809e+08	24787.6	1.69124e+07	31423.6	1.71746e+07	4464.31	1.56017e+07	2085.65	8.52384e+06	1534.1	7.99955e+06	1.39205e+06	3.59292e+07
30932	20210818.1	30115.9	1.32424e+07	15682	3.63111e+07	35464.8	1.19317e+07	5111.22	1.0621e+07	6701.42	9.16235e+07	1601.15	1.42217e+08	25452.5	1.69124e+07	31490.4	1.71746e+07	4464.72	1.53396e+07	2115.44	8.2617e+06	1520.77	7.99955e+06	1.42598e+06	3.57417e+07
30994	20210819.1	29896.2	1.16696e+07	15837.2	3.70975e+07	35718.1	1.19317e+07	5147.92	1.0621e+07	6547.42	9.18856e+07	1625.99	1.27013e+08	25295.4	1.66503e+07	31305.9	1.71746e+07	4456.67	1.56017e+07	2081.01	8.2617e+06	1527.38	7.99955e+06	1.43713e+06	3.58631e+07
31021	20210820.1	29637.3	1.16696e+07	16070.3	3.73597e+07	35107.5	1.2456e+07	5556.99	1.0621e+07	6683.83	9.18856e+07	1514.9	1.53489e+08	25556.4	1.66503e+07	31569.4	1.71746e+07	4504.58	1.56017e+07	2083.19	8.2617e+06	1483.56	9.57242e+06	1.42976e+06	3.63766e+07
31141	20210823.1	26066.4	1.16696e+07	16060.7	3.70975e+07	35767.9	1.21939e+07	5659.39	1.0621e+07	6623.73	9.13613e+07	1532.8	1.45887e+08	25853.6	1.66503e+07	31407.9	1.71746e+07	4518.19	1.58639e+07	2098.24	8.2617e+06	1446.96	8.2617e+06	1.43156e+06	3.59292e+07
31271	20210824.1	30082.6	1.16696e+07	16120.7	3.65732e+07	35922	1.21939e+07	5571.48	1.0621e+07	6659.41	9.18856e+07	1729.56	1.39334e+08	25615.9	1.69124e+07	31638.6	1.71746e+07	4506.96	1.53396e+07	2076.69	8.2617e+06	1477.4	7.99955e+06	1.44317e+06	3.61837e+07
31304	20210825.1	29728.9	1.27181e+07	15907.7	3.70975e+07	35450.7	1.16696e+07	5155.54	1.08831e+07	6589.81	9.08371e+07	1536.53	1.47984e+08	25633.7	1.66503e+07	30752.5	1.7961e+07	4464.89	1.58639e+07	2078.5	8.2617e+06	1518.53	7.99955e+06	1.43086e+06	3.50685e+07

[mergify]

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