On Wed, Oct 31, 2012 at 09:57:18PM +0100,
 Stephane Bortzmeyer <steph...@sources.org> wrote 
 a message of 21 lines which said:

> I upgraded to Icinga 1.8.1 and, since then, trend graphs for Today or
> Last 24 h are empty.

A few details after a question on Twitter:

The alerts appear in the log. Let's take service IMAP on host aetius:

$ grep 'aetius;IMAP' /var/log/icinga/icinga.log 
...
[1351676945] SERVICE ALERT: aetius;IMAP;CRITICAL;SOFT;1;CRITICAL - Socket 
timeout after 10 seconds
[1351677055] SERVICE ALERT: aetius;IMAP;OK;SOFT;2;IMAP OK - 0.120 second 
response time on port 143 [* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN 
NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL 
ACL2=UNION STARTTLS] Courier-IMAP ready. Copyright 1998-2010 Double Precision, 
Inc.  See COPYING for distribution information.]

The alerts are also visible on the Web interface, "Service Alert
History":

[2012-10-31 10:50:55] SERVICE ALERT: aetius;IMAP;OK;SOFT;2;IMAP OK - 0.120 
second response time on port 143 [* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN 
NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL 
ACL2=UNION STARTTLS] Courier-IMAP ready. Copyright 1998-2010 Double Precision, 
Inc. See COPYING for distribution information.]
[2012-10-31 10:49:05] SERVICE ALERT: aetius;IMAP;CRITICAL;SOFT;1;CRITICAL - 
Socket timeout after 10 seconds

But, when I ask for the trends of the last 24 hours for this service,
I get an empty graph:

Indeterminate: 100.000%

It worked before (version 1.7)

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