Enable span compression by default (#1504)

* Enable span compression by default

Disable same_kind compression by default

* CHANGELOG

Author: basepi

CHANGELOG.asciidoc

@@ -39,6 +39,7 @@ endif::[]
 * Add OpenTelemetry API bridge {pull}1411[#1411]
 * Change default for `sanitize_field_names` to sanitize `*auth*` instead of `authorization` {pull}1494[#1494]
 * Add `span_stack_trace_min_duration` to replace deprecated `span_frames_min_duration` {pull}1498[#1498]
+* Enable exact_match span compression by default {pull}1504[#1504]
 
 [float]
 ===== Bug fixes

docs/configuration.asciidoc

@@ -718,7 +718,7 @@ NOTE: This config value is being deprecated. Use
 [options="header"]
 |============
 | Environment                            | Django/Flask               | Default
-| `ELASTIC_APM_SPAN_COMPRESSION_ENABLED` | `SPAN_COMPRESSION_ENABLED` | `False`
+| `ELASTIC_APM_SPAN_COMPRESSION_ENABLED` | `SPAN_COMPRESSION_ENABLED` | `True`
 |============
 
 Enable/disable span compression.
@@ -758,7 +758,7 @@ Two spans are considered exact matches if the following attributes are identical
 [options="header"]
 |============
 | Environment                            | Django/Flask               | Default
-| `ELASTIC_APM_SPAN_COMPRESSION_SAME_KIND_MAX_DURATION` | `SPAN_COMPRESSION_SAME_KIND_MAX_DURATION` | `"5ms"`
+| `ELASTIC_APM_SPAN_COMPRESSION_SAME_KIND_MAX_DURATION` | `SPAN_COMPRESSION_SAME_KIND_MAX_DURATION` | `"0ms"` (disabled)
 |============
 
 Consecutive spans to the same destination that are under this threshold will be compressed into a single composite span.

elasticapm/conf/__init__.py

@@ -611,14 +611,14 @@ class Config(_ConfigBase):
     span_stack_trace_min_duration = _DurationConfigValue(
         "SPAN_STACK_TRACE_MIN_DURATION", default=timedelta(seconds=0.005), unitless_factor=0.001
     )
-    span_compression_enabled = _BoolConfigValue("SPAN_COMPRESSION_ENABLED", default=False)
+    span_compression_enabled = _BoolConfigValue("SPAN_COMPRESSION_ENABLED", default=True)
     span_compression_exact_match_max_duration = _DurationConfigValue(
         "SPAN_COMPRESSION_EXACT_MATCH_MAX_DURATION",
         default=timedelta(seconds=0.05),
     )
     span_compression_same_kind_max_duration = _DurationConfigValue(
         "SPAN_COMPRESSION_SAME_KIND_MAX_DURATION",
-        default=timedelta(seconds=0.005),
+        default=timedelta(seconds=0),
     )
     exit_span_min_duration = _DurationConfigValue(
         "EXIT_SPAN_MIN_DURATION",