The Icinga DB daemon processes the data from the `IcingaApplication`
type only and Icinga DB Web also uses only those stats. However, before
this commit, Icinga DB published all kinds of useless stats to Redis
each second, like the number of (un)reachable hosts, services, and so
on, which is waste of CPU and some other resources. This commit reduces
the published data drastically to only those simple stats coming from
the `IcingaApplication` type.
It's not used. Also, the callback shall run completely at once. This ensures that it won't (continue to) run once another coroutine on the strand calls Timeout#Cancel().
The table sla_history_downtime requires a downtime_end.
The Go daemon takes the cancel_time if has_been_cancelled is 1.
So we must supply a cancel_time whereever has_been_cancelled is 1.
Otherwise the Go daemon can't process some entries.
and, in case of null, fall back to Checkable#check_command.timeout, just like
IcingaDB#SerializeState(). Otherwise the Go daemon crashes. It expects a number.
At the moment, the Icinga DB feature will use that value as-is and
serialize it to JSON, resulting in a crash in Icinga DB down the road
because it expects a boolean.
This commit removes EmbeddedNamespaceValue and ConstEmbeddedNamespaceValue and
reduces NamespaceValue down to a simple struct without inheritance or member
functions. The code from these clases is inlined into the Namespace class. The
class hierarchy determining whether a value is const is moved to an attribute
of NamespaceValue.
This is done in preparation for changes to the locking in the Namespace class.
Currently, it relies on a recursive mutex. In the future, a shared mutex
(read/write lock) should be used instead, which cannot allow recursive locking
(without failing or risk deadlocking on lock upgrades). With this change, all
operations requiring a lock for one operation are within one function, no
recursive locking is not needed any more.
Before (time: vertical, stack: horizontal):
* Checkable::ExecuteCheck
* Checkable::UpdateNextCheck
* IcingaDB::NextCheckChangedHandler
* HSET icinga:host:state
* HSET icinga:checksum:host:state
* ZADD icinga:nextupdate:host
* RandomCheckTask::ScriptFunc
* Checkable::ProcessCheckResult
* Checkable::UpdateNextCheck
* IcingaDB::NextCheckChangedHandler
* HSET icinga:host:state
* HSET icinga:checksum:host:state
* ZADD icinga:nextupdate:host
* IcingaDB::NewCheckResultHandler
* HSET icinga:host:state
* HSET icinga:checksum:host:state
* ZADD icinga:nextupdate:host
* IcingaDB::StateChangeHandler
* XADD icinga:runtime:state
* IcingaDB::ForwardHistoryEntries
* XADD icinga:history:stream:state
After:
* Checkable::ExecuteCheck
* Checkable::UpdateNextCheck
* RandomCheckTask::ScriptFunc
* Checkable::ProcessCheckResult
* Checkable::UpdateNextCheck
* IcingaDB::NewCheckResultHandler
* HSET icinga:host:state
* HSET icinga:checksum:host:state
* ZADD icinga:nextupdate:host
* IcingaDB::StateChangeHandler
* XADD icinga:runtime:state
* IcingaDB::ForwardHistoryEntries
* XADD icinga:history:stream:state
The first state + nextupdate (for overdue) update comes from next_check being
set to now + interval immediately before doing the actual check (not to trigger
it twice). This update is not only not important for the end user, but even
inappropriate. The end user SHALL see next_check being e.g. in -4s, not 5m, as
the check is running at the moment.
The second one is just redundant as IcingaDB::NewCheckResultHandler (the third
one) is called anyway and will update state + nextupdate as well.
If some kind of query is not supposed to be processed at the moment, there is
little point in checking it. During a full dump, state updates are suppressed
(i.e. delayed), so when a dump takes very long, this would have resulted in a
false Redis backlog warning.
The check makes no attempt to explicitly connect to Redis, it uses the
connection of the IcingaDB feature, so this message better describes the state
in this situation.
IcingaDB::GetConnection() uses IcingaDB::m_Rcon which is only initialized in
IcingaDB::Start(), therefore add a nullptr check to the check command.
Additionally, as m_Rcon is potentially accessed concurrently, add a copy of the
value that is safe for concurrent use.
icingadb-web shows multiple lines from the check output collapsed into a single
line. The lines containing just minuses make this look cluttered and making
making it a heading provides little to no benefit. Even when rendering markdown
in the check output at some point, having the lists labeled using normal
paragraphs would look just fine.
- Add icinga2_ and icingadb_ prefixes to make clear which component is
responsible for the value.
- Rename heartbeat_lag to heartbeat_age, describes it better in my opinion and
sound a bit less like something that should be as close to zero as possible.
- Rename redis_dump/database_sync into full_dump/full_sync as this is how these
operations are refered to in log messages as well.
- Rename Redis backlog into Redis query backlog, makes it a bit clearer in my
opinion.
- Rename runtime_backlog into runtime_update_backlog, as the component in
Icinga DB is called that way and this naming is also exposed in log messages.
- Rename dump_config/state/history into config/state/history_dump, makes it
sound more natural.
