this was getting bloated with various contexts and spans and stats
administrivia that obfuscated what was going on a lot. this makes some helper
methods to shove most of that stuff into, and simplifies the context handling
around getting a slot by moving it inside of slot acquisition code. also
removed most uses of `call.Model()` -- I'll kill this thing some day, but if a
reason is needed, then the overhead of dynamic dispatch is unnecessary, we're
inside of the implementee for the agent, we don't want to use the interface
methods inside of that.
*) revert executor wait queue size comparison. This is too
aggresive and with stall check below, now unnecessary.
*) new container logic now checks if stats are constant, if
this is the case, then we assume the system is stalled (eg
running functions that take long time), this means we need
to make progress and spin up a new container.
* Change basic stats to use opentracing rather than Prometheus API directly
* Just ran gofmt
* Extract opentracing access for metrics to common/metrics.go
* Replace quotes strings with constants where possible
Latency stats are not always read-time updated and
if calls are stuck in waiting state, isNewContainerNeeded()
needs to be a bit more aggresive if the wait queue grows.
* Logs should support specifying region when using S3-compatible object store
* Use aws-sdk-go client for s3 backed logstore
* fixes vendor with aws-sdk-go dependencies
* add FN_LOG_DEST for logs, fixup init
* FN_LOG_DEST can point to a remote logging place (papertrail, whatever)
* FN_LOG_PREFIX can add a prefix onto each log line sent to FN_LOG_DEST
default remains stderr with no prefix. users need this to send to various
logging backends, though it could be done operationally, this is somewhat
simpler.
we were doing some configuration stuff inside of init() for some of the global
things. even though they're global, it's nice to keep them all in the normal
server init path.
we have had strange issues with the tracing setup, I tested the last repro of
this repeatedly and didn't have any luck reproducing it, though maybe it comes
back.
* add docs
