I found that lighttpd stops working. After restarting as in this tread
content of pi hole log is different.
Dec 3 15:17:10 dnsmasq[1161]: started, version pi-hole-2.79 cachesize 10000
Dec 3 15:17:10 dnsmasq[1161]: compile time options: IPv6 GNU-getopt no-DBus no-i18n no-IDN DHCP DHCPv6 no-Lua TFTP no-conntrack ip$
Dec 3 15:17:10 dnsmasq[1161]: warning: failed to change owner of /var/log/pihole.log: Operation not permitted
Dec 3 15:17:10 dnsmasq[1161]: using nameserver 1.0.0.1#53
Dec 3 15:17:10 dnsmasq[1161]: using nameserver 1.1.1.1#53
Dec 3 15:17:10 dnsmasq[1161]: read /etc/hosts - 6 addresses
Dec 3 15:17:10 dnsmasq[1161]: read /etc/pihole/local.list - 2 addresses
Dec 3 15:17:10 dnsmasq[1161]: failed to load names from /etc/pihole/black.list: No such file or directory
Dec 3 15:17:12 dnsmasq[1161]: read /etc/pihole/gravity.list - 275338 addresses
Dec 3 16:14:57 dnsmasq[1161]: 1 127.0.0.1/47822 query[A] view.atdmt.com.35626.9169.302br.net from 127.0.0.1
Dec 3 16:14:57 dnsmasq[1161]: 1 127.0.0.1/47822 /etc/pihole/gravity.list view.atdmt.com.35626.9169.302br.net is 0.0.0.0
Dec 3 16:14:57 dnsmasq[1161]: 2 192.168.5.113/37014 query[A] view.atdmt.com.35626.9169.302br.net from 192.168.5.113
Dec 3 16:14:57 dnsmasq[1161]: 2 192.168.5.113/37014 /etc/pihole/gravity.list view.atdmt.com.35626.9169.302br.net is 0.0.0.0
Dec 3 16:26:51 dnsmasq[1161]: 3 192.168.5.50/51153 query[A] client.dropbox.com from 192.168.5.50
Dec 3 16:26:51 dnsmasq[1161]: 3 192.168.5.50/51153 forwarded client.dropbox.com to 1.0.0.1
Dec 3 16:26:51 dnsmasq[1161]: 3 192.168.5.50/51153 forwarded client.dropbox.com to 1.1.1.1
Dec 3 16:26:51 dnsmasq[1161]: 3 192.168.5.50/51153 reply client.dropbox.com is <CNAME>
Dec 3 16:26:51 dnsmasq[1161]: 3 192.168.5.50/51153 reply client.dropbox-dns.com is 162.125.69.3
Dec 3 16:26:53 dnsmasq[1161]: 4 192.168.5.50/52332 query[A] api.dropboxapi.com from 192.168.5.50
Dec 3 16:26:53 dnsmasq[1161]: 4 192.168.5.50/52332 forwarded api.dropboxapi.com to 1.0.0.1
Dec 3 16:26:53 dnsmasq[1161]: 4 192.168.5.50/52332 reply api.dropboxapi.com is <CNAME>
Dec 3 16:26:53 dnsmasq[1161]: 4 192.168.5.50/52332 reply api.dropbox-dns.com is 162.125.69.7
Dec 3 16:27:57 dnsmasq[1161]: 5 192.168.5.50/54713 query[A] d.dropbox.com from 192.168.5.50
Dec 3 16:27:57 dnsmasq[1161]: 5 192.168.5.50/54713 forwarded d.dropbox.com to 1.0.0.1
Dec 3 16:27:57 dnsmasq[1161]: 5 192.168.5.50/54713 reply d.dropbox.com is <CNAME>
Dec 3 16:27:57 dnsmasq[1161]: 5 192.168.5.50/54713 reply d.v.dropbox.com is <CNAME>
Dec 3 16:27:57 dnsmasq[1161]: 5 192.168.5.50/54713 reply d-sjc.v.dropbox.com is 162.125.32.135
Dec 3 16:38:45 dnsmasq[1161]: 6 192.168.5.50/51794 query[A] client.dropbox.com from 192.168.5.50
Dec 3 16:38:45 dnsmasq[1161]: 6 192.168.5.50/51794 forwarded client.dropbox.com to 1.0.0.1
Dec 3 16:38:45 dnsmasq[1161]: 6 192.168.5.50/51794 forwarded client.dropbox.com to 1.1.1.1
Dec 3 16:38:45 dnsmasq[1161]: 6 192.168.5.50/51794 reply client.dropbox.com is <CNAME>
Dec 3 16:38:45 dnsmasq[1161]: 6 192.168.5.50/51794 reply client.dropbox-dns.com is 162.125.69.3
Dec 3 16:38:45 dnsmasq[1161]: 7 192.168.5.50/55901 query[A] block-edge-anycast.dropbox.com from 192.168.5.50
Dec 3 16:38:45 dnsmasq[1161]: 7 192.168.5.50/55901 forwarded block-edge-anycast.dropbox.com to 1.0.0.1
Dec 3 16:38:45 dnsmasq[1161]: 8 192.168.5.50/51519 query[A] dl-debug.dropbox.com from 192.168.5.50