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<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Hi Yinliyin,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">There are two use cases:
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">One is yours, where you have a single monitor that generates “real” alarms, and Vitrage that generates deduced alarms.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Another is where someone has a few monitors, and there might be a collision/equivalence between their alarms.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">The solution that you suggested might solve the first use case, but I wouldn’t want to ignore the second one, which is also valid.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Regarding some of your specific suggestions:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:33.75pt;mso-add-space:auto;text-indent:-18.0pt;mso-list:l1 level1 lfo2">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Calibri"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span dir="LTR"></span><span style="font-size:11.0pt;font-family:Calibri">In templates, we only define the alarm entity for the datasource that the alarm is reported by, such as Nagios.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">[Ifat] This will only work for a single monitor.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"> 2. When evaluator deduce an alarm, it would raise the alarm with the type set to be the datasource that would report the alarm, not be vitrage.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">[Ifat] I don’t think this is right. In Vitrage Alarm view in the UI, displaying the deduced alarm as “Nagios” is misleading, since Nagios did not report this alarm.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">I can think of a solution that is specific to the deduced alarms case, where we will replace a Vitrage alarm with a “real” alarm whenever there is a collision. This solution is easier,
but we should carefully examine all use cases to make sure there is no ambiguity. However, for the more general use case I would prefer the option that we discussed in a previous mail, of having two (or more) alarms connected with a ‘equivalent’ relationship.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">What do you think?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">Ifat.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><b><span style="font-family:Calibri;color:black">From:
</span></b><span style="font-family:Calibri;color:black">"yinliyin@zte.com.cn" <yinliyin@zte.com.cn><br>
<b>Date: </b>Saturday, 14 January 2017 at 09:57<br>
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</span></span></span><![endif]><span dir="LTR"></span><span style="font-size:11.0pt;font-family:Calibri">It won’t solve the general problem of two different monitors that raise the same alarm</span><o:p></o:p></p>
<p style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span dir="LTR"></span><span style="font-size:11.0pt;font-family:Calibri"> [yinliyin] Generally, we would only deploy one monitor for a same alarm. </span><o:p></o:p></p>
<p style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span dir="LTR"></span><span style="font-size:11.0pt;font-family:Calibri">It won’t solve possible conflicts of timestamp and severity between different monitors</span><o:p></o:p></p>
<p style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span dir="LTR"></span><span style="font-size:11.0pt;font-family:Calibri"> [yinliyin] Please see the following contents.</span><o:p></o:p></p>
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</span></span></span><![endif]><span dir="LTR"></span><span style="font-size:11.0pt;font-family:Calibri">It will make the decision of when to delete the alarm more complex (delete it when the deduced alarm is deleted? When Nagios alarm is deleted? both? And
how to change the timestamp and severity in these cases?)</span><o:p></o:p></p>
<p style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span dir="LTR"></span><span style="font-size:11.0pt;font-family:Calibri"> [yinliyin] Please see the following contents.<br>
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<p style="margin-left:36.0pt"><span style="font-size:11.0pt;font-family:Calibri"> The following is the basic idea of solving the problem in this situation:</span><o:p></o:p></p>
<p style="margin-left:36.0pt"><span style="font-size:11.0pt;font-family:Calibri"> 1. In templates, we only define the alarm entity for the datasource that the alarm is reported by, such as Nagios.</span><o:p></o:p></p>
<p style="margin-left:36.0pt"><span style="font-size:11.0pt;font-family:Calibri"> 2. When evaluator deduce an alarm, it would raise the alarm with the type set to be the datasource that would report the alarm, not be vitrage.</span><o:p></o:p></p>
<p style="margin-left:36.0pt"><span style="font-size:11.0pt;font-family:Calibri"> 3. When entity_graph get the events from the "evaluator_queue"(all the alarms in the "evaluator_queue" are deduced alarms), it queries the graph to find out whether there
was a same alarm reported by datasource. If it was true, it would discard the alarm.</span><o:p></o:p></p>
<p style="margin-left:36.0pt"><span style="font-size:11.0pt;font-family:Calibri"> 4. When entity_graph get the events from "queue", it queries the graph to find out whether there was a same alarm deduced by evaluator. If it was true, it would replace
the alarm in the graph with the newly arrived alarm reported by the datasource.</span><o:p></o:p></p>
<p style="margin-left:36.0pt"><span style="font-size:11.0pt;font-family:Calibri"> 5. When the evaluator deduced that an alarm would be deleted, it deletes the alarm whatever the generation type of the alarm be(Generated by datasource or deduced by evaluator).
</span><o:p></o:p></p>
<p style="margin-left:36.0pt"><span style="font-size:11.0pt;font-family:Calibri"> 6. When datasource reports recover event of an alarm, entity_graph would query graph to find out whether the alarm was exist. If the alarm was not exist, entity_graph would
discard the event.</span><o:p></o:p></p>
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