Fix process E2E: cap_add support, no static config, extended discovery timeout

- ddev/docker.py: add cap_add metadata support so integrations can grant Linux
  capabilities to the agent container (needed for sys-probe-lite process scanning)
- datadog_checks_dev/docker.py: get_e2e_process_discovery_metadata now sets
  DD_PROC_ROOT=/host/proc and requests CAP_SYS_PTRACE + CAP_DAC_READ_SEARCH
- krakend/conftest.py: yield None instead of a static instance — a pre-existing
  manual config blocks process autodiscovery from running
- krakend/test_e2e.py: raise discovery_timeout to 90s (the process discovery
  check cycles every ~60s)

Author: vitkyrka

datadog_checks_dev/datadog_checks/dev/docker.py

@@ -275,7 +275,15 @@ def get_e2e_process_discovery_metadata(
         ],
         'env_vars': {
             'DD_AUTOCONFIG_EXCLUDE_FEATURES': 'docker',
+            # The agent container has /proc:/host/proc mounted by ddev. Without this,
+            # the workloadmeta process-collector scans /proc (the container's own PID
+            # namespace) instead of /host/proc, so host processes aren't visible.
+            'DD_PROC_ROOT': '/host/proc',
         },
+        # sys-probe-lite needs these capabilities to read /proc entries of other
+        # processes for service discovery. Without them it falls back to scanning
+        # only the agent's own PID namespace and finds no host processes.
+        'cap_add': ['SYS_PTRACE', 'DAC_READ_SEARCH'],
     }
 
 

datadog_checks_dev/tests/test_docker.py

@@ -89,7 +89,9 @@ def test_get_e2e_process_discovery_metadata(tmp_path):
         ],
         'env_vars': {
             'DD_AUTOCONFIG_EXCLUDE_FEATURES': 'docker',
+            'DD_PROC_ROOT': '/host/proc',
         },
+        'cap_add': ['SYS_PTRACE', 'DAC_READ_SEARCH'],
     }
 
 

ddev/src/ddev/e2e/agent/docker.py

@@ -275,6 +275,9 @@ def start(self, *, agent_build: str | None, local_packages: dict[Path, str], env
         for key, value in sorted(env_vars.items()):
             command.extend(['-e', f'{key}={value}'])
 
+        for cap in self.metadata.get('cap_add', []):
+            command.extend(['--cap-add', cap])
+
         # The docker `--add-host` command will reliably create entries in the `/etc/hosts` file,
         # otherwise, edits to that file will be overwritten on container restarts
         for host, ip in self.metadata.get('custom_hosts', []):

krakend/tests/conftest.py

@@ -73,9 +73,7 @@ def run_docker_process_e2e(env_vars: dict[str, str], conditions: list[LazyFuncti
         conditions=conditions,
     ):
         yield (
-            {
-                "instances": [{"openmetrics_endpoint": OPEN_METRICS_ENDPOINT}],
-            },
+            None,  # No static config — process autodiscovery must find and configure the check.
             get_e2e_process_discovery_metadata(),
         )
 

krakend/tests/test_e2e.py

@@ -60,7 +60,7 @@ def test_e2e_process_discovery(dd_agent_check_discovery, is_process_e2e):
     if not is_process_e2e:
         pytest.skip('process discovery test only runs in the e2e-process environment')
 
-    aggregator = dd_agent_check_discovery(check_rate=True)
+    aggregator = dd_agent_check_discovery(check_rate=True, discovery_timeout=90)
 
     metadata_metrics = get_metrics_from_metadata()