Running a grep command with the same search phrases produces different results from your php code. The php total for "failed" is the same, but grep shows 220 sent witnesses, while the php shows only 213. No witnesses were sent between runs.
/var/log/miner # date
Thu Jun 9 03:08:18 UTC 2022
/var/log/miner # /opt/miner/processlogs.php
Using logs in folder /var/log/miner/
General Witnesses Overview
Total witnesses = 213 (9.65/hour)
Succesfully delivered = 209 (98.12%)
Failed = 4 (1.88%)
/var/log/miner # date
Thu Jun 9 03:09:09 UTC 2022
/var/log/miner # grep "miner_onion_server_light:decrypt:" console.log* | grep "sending witness at RSSI"|wc -l
220
/var/log/miner # grep "@miner_poc_grpc_client_statem:send_report" console.log* | grep "failed to submit report"|wc -l
4
/var/log/miner # grep "miner_onion_server_light:decrypt:" console.log|grep "sending witness at RSSI"|sort|tail
2022-06-09 01:03:58.969 153 [info] <0.2102.0>@miner_onion_server_light:decrypt:{230,13} sending witness at RSSI: -110, Frequency: 904.7, SNR: -1.8
2022-06-09 01:09:52.240 153 [info] <0.2102.0>@miner_onion_server_light:decrypt:{230,13} sending witness at RSSI: -88, Frequency: 904.1, SNR: 10.8
2022-06-09 01:16:29.374 201 [info] <0.2096.0>@miner_onion_server_light:decrypt:{230,13} sending witness at RSSI: -103, Frequency: 904.5, SNR: 6.5
2022-06-09 01:22:46.038 201 [info] <0.2096.0>@miner_onion_server_light:decrypt:{230,13} sending witness at RSSI: -97, Frequency: 904.3, SNR: 5.0
2022-06-09 01:23:22.905 201 [info] <0.2096.0>@miner_onion_server_light:decrypt:{230,13} sending witness at RSSI: -118, Frequency: 903.9, SNR: -7.5
2022-06-09 02:17:19.792 203 [info] <0.2075.0>@miner_onion_server_light:decrypt:{230,13} sending witness at RSSI: -116, Frequency: 904.9, SNR: -7.5
2022-06-09 02:22:54.526 203 [info] <0.2075.0>@miner_onion_server_light:decrypt:{230,13} sending witness at RSSI: -115, Frequency: 903.9, SNR: -6.0
2022-06-09 02:24:42.024 203 [info] <0.2075.0>@miner_onion_server_light:decrypt:{230,13} sending witness at RSSI: -110, Frequency: 904.9, SNR: -4.0
2022-06-09 02:50:24.910 203 [info] <0.2075.0>@miner_onion_server_light:decrypt:{230,13} sending witness at RSSI: -115, Frequency: 903.9, SNR: -3.8
2022-06-09 03:00:33.104 203 [info] <0.2075.0>@miner_onion_server_light:decrypt:{230,13} sending witness at RSSI: -119, Frequency: 904.7, SNR: -11.8
/var/log/miner # date
Thu Jun 9 03:11:25 UTC 2022