> I am quite new here at pool.ntp.org,

Welcome!  We don't bite...much. :-)

> When I saw this graph, I was really badly surprised [193.87.160.18's
> score graph]

> Does it mean my server is not suitable for pool?

No, I don't think so...not that I'm an expert.  Your server dropped
below the cutoff line for a few hours, but only a few, and note that
whatever problem was affecting it Tuesday seems to have cleared up.

Note also that the monitoring is done from North America (California, I
think), and that hosts with poor connectivity (high - or variable -
latency, or packet loss) to North America may appear less suitable on
the status graphs than they actually are.  (Or at least that's how it
was last time I recall seeing it discussed on the list; I'm sure
someone who knows more will step in and correct me if I've got it
wrong.)

> What makes me even more curious is this graph: [193.87.160.18's
> offset graph]

> Sine wave?  Is that normal thing?  Should that mean something for me?

Well, as I said, I'm no expert, but that looks very odd to me.  It must
mean _something_, but I've been unable to come up with even wild
speculation for what, unless you can find something in the host's
environment that is oscillating on a 7-hour-20-minute cycle.  Note also
that the glitch at the Tue/Wed boundary is a glitch in not just
amplitude but also phase.

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